OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject connection attempts from a client where this special form of padding is present, because this indicates that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this is the version that is being requested). The implementation of this padding check inverted the logic so that the connection attempt is accepted if the padding is present, and rejected if it is absent. This means that such as server will accept a connection if a version rollback attack has occurred. Further the server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL 1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2 server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding mode. Applications that directly call that function or use that padding mode will encounter this issue. However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x).

The version of AOS installed on the remote host is prior to 6.5.6.7. It is, therefore, affected by multiple vulnerabilities as referenced in the NXSA-AOS-6.5.6.7 advisory.

  - Improper access control in the Intel(R) Ethernet Controller RDMA driver for linux before version 1.9.30     may allow an unauthenticated user to potentially enable escalation of privilege via network access.
    (CVE-2023-25775)

  - In addition to the c_rehash shell command injection identified in CVE-2022-1292, further circumstances     where the c_rehash script does not properly sanitise shell metacharacters to prevent command injection     were found by code review. When the CVE-2022-1292 was fixed it was not discovered that there are other     places in the script where the file names of certificates being hashed were possibly passed to a command     executed through the shell. This script is distributed by some operating systems in a manner where it is     automatically executed. On such operating systems, an attacker could execute arbitrary commands with the     privileges of the script. Use of the c_rehash script is considered obsolete and should be replaced by the     OpenSSL rehash command line tool. Fixed in OpenSSL 3.0.4 (Affected 3.0.0,3.0.1,3.0.2,3.0.3). Fixed in     OpenSSL 1.1.1p (Affected 1.1.1-1.1.1o). Fixed in OpenSSL 1.0.2zf (Affected 1.0.2-1.0.2ze). (CVE-2022-2068)

  - Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant     code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead     of using a named curve). In those cases it is possible that such a group does not have the cofactor     present. This can occur even where all the parameters match a known named curve. If such a curve is used     then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery     during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability     to time the creation of a large number of signatures where explicit parameters with no co-factor present     are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because     explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL     1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s). (CVE-2019-1547)

  - OpenSSL has internal defaults for a directory tree where it can find a configuration file as well as     certificates used for verification in TLS. This directory is most commonly referred to as OPENSSLDIR, and     is configurable with the --prefix / --openssldir configuration options. For OpenSSL versions 1.1.0 and     1.1.1, the mingw configuration targets assume that resulting programs and libraries are installed in a     Unix-like environment and the default prefix for program installation as well as for OPENSSLDIR should be     '/usr/local'. However, mingw programs are Windows programs, and as such, find themselves looking at sub-     directories of 'C:/usr/local', which may be world writable, which enables untrusted users to modify     OpenSSL's default configuration, insert CA certificates, modify (or even replace) existing engine modules,     etc. For OpenSSL 1.0.2, '/usr/local/ssl' is used as default for OPENSSLDIR on all Unix and Windows     targets, including Visual C builds. However, some build instructions for the diverse Windows targets on     1.0.2 encourage you to specify your own --prefix. OpenSSL versions 1.1.1, 1.1.0 and 1.0.2 are affected by     this issue. Due to the limited scope of affected deployments this has been assessed as low severity and     therefore we are not creating new releases at this time. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c).
    Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
    (CVE-2019-1552)

  - In situations where an attacker receives automated notification of the success or failure of a decryption     attempt an attacker, after sending a very large number of messages to be decrypted, can recover a     CMS/PKCS7 transported encryption key or decrypt any RSA encrypted message that was encrypted with the     public RSA key, using a Bleichenbacher padding oracle attack. Applications are not affected if they use a     certificate together with the private RSA key to the CMS_decrypt or PKCS7_decrypt functions to select the     correct recipient info to decrypt. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL     1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s). (CVE-2019-1563)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update of the openssl package has been released.

The version of IBM Cognos Analytics installed on the remote host is prior to 11.1.7 FP8, 11.2.4 FP3, or 12.0.2. It is, therefore, affected by multiple vulnerabilities as referenced in the IBM Security Bulletin No. 7123154, including the following:

  - When deserializing untrusted or corrupted data, it is possible for a reader to consume memory beyond the   allowed constraints and thus lead to out of memory on the system. This issue affects Java applications using   Apache Avro Java SDK up to and including 1.11.2. Users should update to apache-avro version 1.11.3 which   addresses this issue. (CVE-2023-39410)

  - In order to decrypt SM2 encrypted data an application is expected to call the API function   EVP_PKEY_decrypt(). Typically an application will call this function twice. The first time, on entry, the   'out' parameter can be NULL and, on exit, the 'outlen' parameter is populated with the buffer size required   to hold the decrypted plaintext. The application can then allocate a sufficiently sized buffer and call   EVP_PKEY_decrypt() again, but this time passing a non-NULL value for the 'out' parameter. A bug in the   implementation of the SM2 decryption code means that the calculation of the buffer size required to hold the   plaintext returned by the first call to EVP_PKEY_decrypt() can be smaller than the actual size required by   the second call. This can lead to a buffer overflow when EVP_PKEY_decrypt() is called by the application a   second time with a buffer that is too small. A malicious attacker who is able present SM2 content for   decryption to an application could cause attacker chosen data to overflow the buffer by up to a maximum of   62 bytes altering the contents of other data held after the buffer, possibly changing application behaviour   or causing the application to crash. The location of the buffer is application dependent but is typically   heap allocated. Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). (CVE-2021-3711)

  - SnakeYaml's Constructor() class does not restrict types which can be instantiated during deserialization.
  Deserializing yaml content provided by an attacker can lead to remote code execution. We recommend using   SnakeYaml's SafeConsturctor when parsing untrusted content to restrict deserialization. We recommend   upgrading to version 2.0 and beyond. (CVE-2022-1471)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

On February 16, 2021, OpenSSL published security updates addressing CVE-2021-23841, CVE-2021-23839, and CVE-2021-23840. Previous releases of Puppet Agent contain a vulnerable version of OpenSSL. For more information about this vulnerability, refer to the OpenSSL security announcement.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Junos OS installed on the remote host is affected by multiple vulnerabilities as referenced in the JSA69715 advisory.

  - The Raccoon attack exploits a flaw in the TLS specification which can lead to an attacker being able to     compute the pre-master secret in connections which have used a Diffie-Hellman (DH) based ciphersuite. In     such a case this would result in the attacker being able to eavesdrop on all encrypted communications sent     over that TLS connection. The attack can only be exploited if an implementation re-uses a DH secret across     multiple TLS connections. Note that this issue only impacts DH ciphersuites and not ECDH ciphersuites.
    This issue affects OpenSSL 1.0.2 which is out of support and no longer receiving public updates. OpenSSL     1.1.1 is not vulnerable to this issue. Fixed in OpenSSL 1.0.2w (Affected 1.0.2-1.0.2v). (CVE-2020-1968)

  - The X.509 GeneralName type is a generic type for representing different types of names. One of those name     types is known as EDIPartyName. OpenSSL provides a function GENERAL_NAME_cmp which compares different     instances of a GENERAL_NAME to see if they are equal or not. This function behaves incorrectly when both     GENERAL_NAMEs contain an EDIPARTYNAME. A NULL pointer dereference and a crash may occur leading to a     possible denial of service attack. OpenSSL itself uses the GENERAL_NAME_cmp function for two purposes: 1)     Comparing CRL distribution point names between an available CRL and a CRL distribution point embedded in     an X509 certificate 2) When verifying that a timestamp response token signer matches the timestamp     authority name (exposed via the API functions TS_RESP_verify_response and TS_RESP_verify_token) If an     attacker can control both items being compared then that attacker could trigger a crash. For example if     the attacker can trick a client or server into checking a malicious certificate against a malicious CRL     then this may occur. Note that some applications automatically download CRLs based on a URL embedded in a     certificate. This checking happens prior to the signatures on the certificate and CRL being verified.
    OpenSSL's s_server, s_client and verify tools have support for the -crl_download option which implements     automatic CRL downloading and this attack has been demonstrated to work against those tools. Note that an     unrelated bug means that affected versions of OpenSSL cannot parse or construct correct encodings of     EDIPARTYNAME. However it is possible to construct a malformed EDIPARTYNAME that OpenSSL's parser will     accept and hence trigger this attack. All OpenSSL 1.1.1 and 1.0.2 versions are affected by this issue.
    Other OpenSSL releases are out of support and have not been checked. Fixed in OpenSSL 1.1.1i (Affected     1.1.1-1.1.1h). Fixed in OpenSSL 1.0.2x (Affected 1.0.2-1.0.2w). (CVE-2020-1971)

  - ASN.1 strings are represented internally within OpenSSL as an ASN1_STRING structure which contains a     buffer holding the string data and a field holding the buffer length. This contrasts with normal C strings     which are repesented as a buffer for the string data which is terminated with a NUL (0) byte. Although not     a strict requirement, ASN.1 strings that are parsed using OpenSSL's own d2i functions (and other similar     parsing functions) as well as any string whose value has been set with the ASN1_STRING_set() function will     additionally NUL terminate the byte array in the ASN1_STRING structure. However, it is possible for     applications to directly construct valid ASN1_STRING structures which do not NUL terminate the byte array     by directly setting the data and length fields in the ASN1_STRING array. This can also happen by using     the ASN1_STRING_set0() function. Numerous OpenSSL functions that print ASN.1 data have been found to     assume that the ASN1_STRING byte array will be NUL terminated, even though this is not guaranteed for     strings that have been directly constructed. Where an application requests an ASN.1 structure to be     printed, and where that ASN.1 structure contains ASN1_STRINGs that have been directly constructed by the     application without NUL terminating the data field, then a read buffer overrun can occur. The same thing     can also occur during name constraints processing of certificates (for example if a certificate has been     directly constructed by the application instead of loading it via the OpenSSL parsing functions, and the     certificate contains non NUL terminated ASN1_STRING structures). It can also occur in the     X509_get1_email(), X509_REQ_get1_email() and X509_get1_ocsp() functions. If a malicious actor can cause an     application to directly construct an ASN1_STRING and then process it through one of the affected OpenSSL     functions then this issue could be hit. This might result in a crash (causing a Denial of Service attack).
    It could also result in the disclosure of private memory contents (such as private keys, or sensitive     plaintext). Fixed in OpenSSL 1.1.1l (Affected 1.1.1-1.1.1k). Fixed in OpenSSL 1.0.2za (Affected     1.0.2-1.0.2y). (CVE-2021-3712)

  - OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to     support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack     when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed     to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject     connection attempts from a client where this special form of padding is present, because this indicates     that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this     is the version that is being requested). The implementation of this padding check inverted the logic so     that the connection attempt is accepted if the padding is present, and rejected if it is absent. This     means that such as server will accept a connection if a version rollback attack has occurred. Further the     server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL     1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2     server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured     SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in     the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to     this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This     also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not     support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding     mode. Applications that directly call that function or use that padding mode will encounter this issue.
    However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a     security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates.
    Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j.
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x). (CVE-2021-23839)

  - Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument     in some cases where the input length is close to the maximum permissable length for an integer on the     platform. In such cases the return value from the function call will be 1 (indicating success), but the     output length value will be negative. This could cause applications to behave incorrectly or crash.
    OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to     OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out     of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should     upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i).
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x). (CVE-2021-23840)

  - The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based     on the issuer and serial number data contained within an X509 certificate. However it fails to correctly     handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is     maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a     potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by     OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on     certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are     affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x     and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving     public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should     upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected     1.0.2-1.0.2x). (CVE-2021-23841)

Note: Nessus found J-Web enabled [set system services web-management http(s)] on this device.

The version of openssl11 installed on the remote host is prior to 1.1.1g-12. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1612 advisory.

    Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument     in some cases where the input length is close to the maximum permissible length for an integer on the     platform. In such cases the return value from the function call will be 1 (indicating success), but the     output length value will be negative. This could cause applications to behave incorrectly or crash.
    (CVE-2021-23840)

    Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument     in some cases where the input length is close to the maximum permissable length for an integer on the     platform. In such cases the return value from the function call will be 1 (indicating success), but the     output length value will be negative. This could cause applications to behave incorrectly or crash.
    OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to     OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out     of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should     upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i).
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x). (CVE-2021-23840)

    The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based     on the issuer and serial number data contained within an X509 certificate. However it fails to correctly     handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is     maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a     potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by     OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on     certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are     affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x     and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving     public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should     upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected     1.0.2-1.0.2x). (CVE-2021-23841)

    The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based     on the issuer and serial number data contained within an X509 certificate. However it fails to correctly     handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is     maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a     potential denial of service attack. (CVE-2021-23841)

    The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based     on the issuer and serial number data contained within an X509 certificate. However it fails to correctly     handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is     maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a     potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by     OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on     certificates that may have been obtained from untrusted sources. (CVE-2021-23841)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of openssl installed on the remote host is prior to 1.0.2k-19. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1608 advisory.

    OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to     support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack     when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed     to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject     connection attempts from a client where this special form of padding is present, because this indicates     that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this     is the version that is being requested). The implementation of this padding check inverted the logic so     that the connection attempt is accepted if the padding is present, and rejected if it is absent. This     means that such as server will accept a connection if a version rollback attack has occurred. Further the     server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL     1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2     server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured     SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in     the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to     this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This     also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not     support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding     mode. Applications that directly call that function or use that padding mode will encounter this issue.
    However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a     security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates.
    Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j.
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x). (CVE-2021-23839)

    Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument     in some cases where the input length is close to the maximum permissable length for an integer on the     platform. In such cases the return value from the function call will be 1 (indicating success), but the     output length value will be negative. This could cause applications to behave incorrectly or crash.
    OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to     OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out     of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should     upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i).
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x). (CVE-2021-23840)

    The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based     on the issuer and serial number data contained within an X509 certificate. However it fails to correctly     handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is     maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a     potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by     OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on     certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are     affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x     and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving     public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should     upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected     1.0.2-1.0.2x). (CVE-2021-23841)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of OpenSSL installed on the remote host is prior to 1.0.2y. It is, therefore, affected by multiple vulnerabilities as referenced in the 1.0.2y advisory.

  - The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based     on the issuer and serial number data contained within an X509 certificate. However it fails to correctly     handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is     maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a     potential denial of service attack. The function X509_issuer_and_serial_hash() is never directly called by     OpenSSL itself so applications are only vulnerable if they use this function directly and they use it on     certificates that may have been obtained from untrusted sources. OpenSSL versions 1.1.1i and below are     affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x     and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving     public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should     upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected     1.0.2-1.0.2x). (CVE-2021-23841)

  - Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument     in some cases where the input length is close to the maximum permissable length for an integer on the     platform. In such cases the return value from the function call will be 1 (indicating success), but the     output length value will be negative. This could cause applications to behave incorrectly or crash.
    OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to     OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out     of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should     upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i).
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x). (CVE-2021-23840)

  - OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to     support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack     when unpadding an RSA signature. Clients that support SSL or TLS versions greater than SSLv2 are supposed     to use a special form of padding. A server that supports greater than SSLv2 is supposed to reject     connection attempts from a client where this special form of padding is present, because this indicates     that a version rollback has occurred (i.e. both client and server support greater than SSLv2, and yet this     is the version that is being requested). The implementation of this padding check inverted the logic so     that the connection attempt is accepted if the padding is present, and rejected if it is absent. This     means that such as server will accept a connection if a version rollback attack has occurred. Further the     server will erroneously reject a connection if a normal SSLv2 connection attempt is made. Only OpenSSL     1.0.2 servers from version 1.0.2s to 1.0.2x are affected by this issue. In order to be vulnerable a 1.0.2     server must: 1) have configured SSLv2 support at compile time (this is off by default), 2) have configured     SSLv2 support at runtime (this is off by default), 3) have configured SSLv2 ciphersuites (these are not in     the default ciphersuite list) OpenSSL 1.1.1 does not have SSLv2 support and therefore is not vulnerable to     this issue. The underlying error is in the implementation of the RSA_padding_check_SSLv23() function. This     also affects the RSA_SSLV23_PADDING padding mode used by various other functions. Although 1.1.1 does not     support SSLv2 the RSA_padding_check_SSLv23() function still exists, as does the RSA_SSLV23_PADDING padding     mode. Applications that directly call that function or use that padding mode will encounter this issue.
    However since there is no support for the SSLv2 protocol in 1.1.1 this is considered a bug and not a     security issue in that version. OpenSSL 1.0.2 is out of support and no longer receiving public updates.
    Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j.
    Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x). (CVE-2021-23839)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The OpenSSL project reports :

NULL pointer deref in X509_issuer_and_serial_hash() CVE-2021-23841(Moderate) The OpenSSL public API function X509_issuer_and_serial_hash() attempts to create a unique hash value based on the issuer and serial number data contained within an X509 certificate. However it fails to correctly handle any errors that may occur while parsing the issuer field (which might occur if the issuer field is maliciously constructed). This may subsequently result in a NULL pointer deref and a crash leading to a potential denial of service attack.

Integer overflow in CipherUpdate CVE-2021-23840(Low) Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash.

ID	Name	Product	Family	Severity
212513	Nutanix AOS : Multiple Vulnerabilities (NXSA-AOS-6.5.6.7)	Nessus	Misc.	high
202851	Photon OS 2.0: Openssl PHSA-2021-2.0-0325	Nessus	PhotonOS Local Security Checks	low
193868	IBM Cognos Analytics 11.1.1 < 11.1.7 FP8 / 11.2.x < 11.2.4 FP3 / 12.0.x < 12.0.2 (7123154)	Nessus	CGI abuses	critical
184148	Puppet Agent 6.x < 6.22.1 / 7.x < 7.6.1 Vulnerability	Nessus	Windows	low
166767	Juniper Junos OS Multiple Vulnerabilities (JSA69715)	Nessus	Junos Local Security Checks	high
147910	Amazon Linux 2 : openssl11 (ALAS-2021-1612)	Nessus	Amazon Linux Local Security Checks	low
147005	Photon OS 1.0: Openssl PHSA-2021-1.0-0366	Nessus	PhotonOS Local Security Checks	low
146873	Photon OS 3.0: Openssl PHSA-2021-3.0-0200	Nessus	PhotonOS Local Security Checks	low
146628	Amazon Linux 2 : openssl (ALAS-2021-1608)	Nessus	Amazon Linux Local Security Checks	low
146591	OpenSSL 1.0.2 < 1.0.2y Multiple Vulnerabilities	Nessus	Web Servers	low
146560	FreeBSD : OpenSSL -- Multiple vulnerabilities (96a21236-707b-11eb-96d8-d4c9ef517024)	Nessus	FreeBSD Local Security Checks	low

Detections

Analytics

CVE-2021-23839

low

Tenable Plugins

high

low

critical

low

high

low

low

low

low

low

low