Security fix for CVE-2016-2108, CVE-2016-2107, CVE-2016-2105, CVE-2016-2106

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

From Red Hat Security Advisory 2016:0996 :

An update for openssl is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es) :

* A flaw was found in the way OpenSSL encoded certain ASN.1 data structures. An attacker could use this flaw to create a specially crafted certificate which, when verified or re-encoded by OpenSSL, could cause it to crash, or execute arbitrary code using the permissions of the user running an application compiled against the OpenSSL library. (CVE-2016-2108)

* Two integer overflow flaws, leading to buffer overflows, were found in the way the EVP_EncodeUpdate() and EVP_EncryptUpdate() functions of OpenSSL parsed very large amounts of input data. A remote attacker could use these flaws to crash an application using OpenSSL or, possibly, execute arbitrary code with the permissions of the user running that application. (CVE-2016-2105, CVE-2016-2106)

* It was discovered that OpenSSL leaked timing information when decrypting TLS/SSL and DTLS protocol encrypted records when the connection used the AES CBC cipher suite and the server supported AES-NI. A remote attacker could possibly use this flaw to retrieve plain text from encrypted packets by using a TLS/SSL or DTLS server as a padding oracle. (CVE-2016-2107)

* Several flaws were found in the way BIO_*printf functions were implemented in OpenSSL. Applications which passed large amounts of untrusted data through these functions could crash or potentially execute code with the permissions of the user running such an application. (CVE-2016-0799, CVE-2016-2842)

* A denial of service flaw was found in the way OpenSSL parsed certain ASN.1-encoded data from BIO (OpenSSL's I/O abstraction) inputs. An application using OpenSSL that accepts untrusted ASN.1 BIO input could be forced to allocate an excessive amount of data. (CVE-2016-2109)

Red Hat would like to thank the OpenSSL project for reporting CVE-2016-2108, CVE-2016-2842, CVE-2016-2105, CVE-2016-2106, CVE-2016-2107, and CVE-2016-0799. Upstream acknowledges Huzaifa Sidhpurwala (Red Hat), Hanno Bock, and David Benjamin (Google) as the original reporters of CVE-2016-2108; Guido Vranken as the original reporter of CVE-2016-2842, CVE-2016-2105, CVE-2016-2106, and CVE-2016-0799; and Juraj Somorovsky as the original reporter of CVE-2016-2107.

Security Fix(es) :

  - A flaw was found in the way OpenSSL encoded certain     ASN.1 data structures. An attacker could use this flaw     to create a specially crafted certificate which, when     verified or re-encoded by OpenSSL, could cause it to     crash, or execute arbitrary code using the permissions     of the user running an application compiled against the     OpenSSL library. (CVE-2016-2108)

  - Two integer overflow flaws, leading to buffer overflows,     were found in the way the EVP_EncodeUpdate() and     EVP_EncryptUpdate() functions of OpenSSL parsed very     large amounts of input data. A remote attacker could use     these flaws to crash an application using OpenSSL or,     possibly, execute arbitrary code with the permissions of     the user running that application. (CVE-2016-2105,     CVE-2016-2106)

  - It was discovered that OpenSSL leaked timing information     when decrypting TLS/SSL and DTLS protocol encrypted     records when the connection used the AES CBC cipher     suite and the server supported AES-NI. A remote attacker     could possibly use this flaw to retrieve plain text from     encrypted packets by using a TLS/SSL or DTLS server as a     padding oracle. (CVE-2016-2107)

  - Several flaws were found in the way BIO_*printf     functions were implemented in OpenSSL. Applications     which passed large amounts of untrusted data through     these functions could crash or potentially execute code     with the permissions of the user running such an     application. (CVE-2016-0799, CVE-2016-2842)

  - A denial of service flaw was found in the way OpenSSL     parsed certain ASN.1-encoded data from BIO (OpenSSL's     I/O abstraction) inputs. An application using OpenSSL     that accepts untrusted ASN.1 BIO input could be forced     to allocate an excessive amount of data. (CVE-2016-2109)

The remote OracleVM system is missing necessary patches to address critical security updates :

  - fix CVE-2016-2177 - possible integer overflow

  - fix CVE-2016-2178 - non-constant time DSA operations

  - fix CVE-2016-2179 - further DoS issues in DTLS

  - fix CVE-2016-2180 - OOB read in TS_OBJ_print_bio

  - fix CVE-2016-2181 - DTLS1 replay protection and     unprocessed records issue

  - fix CVE-2016-2182 - possible buffer overflow in     BN_bn2dec

  - fix CVE-2016-6302 - insufficient TLS session ticket HMAC     length check

  - fix CVE-2016-6304 - unbound memory growth with OCSP     status request

  - fix CVE-2016-6306 - certificate message OOB reads

  - mitigate CVE-2016-2183 - degrade all 64bit block ciphers     and RC4 to 112 bit effective strength

  - replace expired testing certificates

  - fix CVE-2016-2105 - possible overflow in base64 encoding

  - fix CVE-2016-2106 - possible overflow in     EVP_EncryptUpdate

  - fix CVE-2016-2107 - padding oracle in stitched AES-NI     CBC-MAC

  - fix CVE-2016-2108 - memory corruption in ASN.1 encoder

  - fix CVE-2016-2109 - possible DoS when reading ASN.1 data     from BIO

  - fix CVE-2016-0799 - memory issues in BIO_printf

According to its banner, the version of HP System Management Homepage (SMH) hosted on the remote web server is prior to 7.6. It is, therefore, affected by the following vulnerabilities :

  - A heap buffer overflow condition exists in OpenSSL in     the EVP_EncodeUpdate() function within file     crypto/evp/encode.c that is triggered when handling     a large amount of input data. An unauthenticated, remote     attacker can exploit this to cause a denial of service     condition. (CVE-2016-2105)

  - A heap buffer overflow condition exists in OpenSSL in     the EVP_EncryptUpdate() function within file     crypto/evp/evp_enc.c that is triggered when handling a     large amount of input data after a previous call occurs     to the same function with a partial block. An     unauthenticated, remote attacker can exploit this to     cause a denial of service condition. (CVE-2016-2106)

  - Multiple flaws exist OpenSSL in the     aesni_cbc_hmac_sha1_cipher() function in file     crypto/evp/e_aes_cbc_hmac_sha1.c and the     aesni_cbc_hmac_sha256_cipher() function in file     crypto/evp/e_aes_cbc_hmac_sha256.c that are triggered     when the connection uses an AES-CBC cipher and AES-NI     is supported by the server. A man-in-the-middle attacker     can exploit these to conduct a padding oracle attack,     resulting in the ability to decrypt the network traffic.
    (CVE-2016-2107)

  - Multiple unspecified flaws exist in OpenSSL in the d2i     BIO functions when reading ASN.1 data from a BIO due to     invalid encoding causing a large allocation of memory.
    An unauthenticated, remote attacker can exploit these to     cause a denial of service condition through resource     exhaustion. (CVE-2016-2109)

  - A certificate validation bypass vulnerability exists in     cURL and libcurl due to improper validation of TLS     certificates. A man-in-the-middle attacker can exploit     this, via a spoofed certificate that appears valid, to     disclose or manipulate transmitted data. (CVE-2016-3739)

  - An integer overflow condition exists in PHP in the     php_raw_url_encode() function within file     ext/standard/url.c due to improper validation of     user-supplied input. An unauthenticated, remote attacker     can exploit this to have an unspecified impact.
    (CVE-2016-4070)     
  - A flaw exists in PHP in the php_snmp_error() function     within file ext/snmp/snmp.c that is triggered when     handling format string specifiers. An unauthenticated,     remote attacker can exploit this, via a crafted SNMP     object, to cause a denial of service or to execute     arbitrary code. (CVE-2016-4071)

  - An invalid memory write error exists in PHP when     handling the path of phar file names that allows an     attacker to have an unspecified impact. (CVE-2016-4072)

  - A remote code execution vulnerability exists in PHP in     phar_object.c due to improper handling of zero-length     uncompressed data. An unauthenticated, remote attacker     can exploit this, via a specially crafted TAR, ZIP, or     PHAR file, to cause a denial of service condition or the     execution of arbitrary code. (CVE-2016-4342)

  - A remote code execution vulnerability exists in PHP in     the phar_make_dirstream() function within file     ext/phar/dirstream.c due to improper handling of     ././@LongLink files. An unauthenticated, remote attacker     can exploit this, via a specially crafted TAR file, to     cause a denial of service condition or the execution of     arbitrary code. (CVE-2016-4343)

  - A cross-site scripting (XSS) vulnerability exists due to     improper validation of user-supplied input. An     unauthenticated, remote attacker can exploit this, via a     specially crafted request, to execute arbitrary script     code in a user's browser session. (CVE-2016-4393)

  - An unspecified HTTP Strict Transport Security (HSTS)     bypass vulnerability exists that allows authenticated,     remote attackers to disclose sensitive information.
    (CVE-2016-4394)

  - A remote code execution vulnerability exists due to an     overflow condition in the mod_smh_config.so library     caused by improper validation of user-supplied input     when parsing the admin-group parameter supplied to the     /proxy/SetSMHData endpoint. An unauthenticated, remote     attacker can exploit this, via a specially crafted     request, to cause a denial of service condition or the     execution of arbitrary code. (CVE-2016-4395)

  - A remote code execution vulnerability exists due to an     overflow condition in the mod_smh_config.so library     caused by improper validation of user-supplied input     when parsing the TKN parameter supplied to the     /Proxy/SSO endpoint. An unauthenticated, remote     attacker can exploit this, via a specially crafted     request, to cause a denial of service condition or the     execution of arbitrary code. (CVE-2016-4396)

  - An out-of-bounds read error exists in PHP in the     php_str2num() function in bcmath.c when handling     negative scales. An unauthenticated, remote attacker can     exploit this, via a crafted call, to cause a denial of     service condition or the disclosure of memory contents.
    (CVE-2016-4537)

  - A flaw exists in PHP the bcpowmod() function in bcmath.c     due to modifying certain data structures without     considering whether they are copies of the _zero_,
    _one_, or _two_ global variables. An unauthenticated,     remote attacker can exploit this, via a crafted call, to     cause a denial of service condition. (CVE-2016-4538)

  - A flaw exists in PHP in the xml_parse_into_struct()     function in xml.c when handling specially crafted XML     contents. An unauthenticated, remote attacker can     exploit this to cause a denial of service condition.
    (CVE-2016-4539)

  - Multiple out-of-bounds read errors exist in PHP within     file ext/intl/grapheme/grapheme_string.c when handling     negative offsets in the zif_grapheme_stripos() and     zif_grapheme_strpos() functions. An unauthenticated,     remote attacker can exploit these issues to cause a     denial of service condition or disclose memory contents.
    (CVE-2016-4540, CVE-2016-4541)

  - A flaw exists in PHP in the exif_process_IFD_TAG()     function in exif.c due to improper construction of     spprintf arguments. An unauthenticated, remote attacker     can exploit this, via crafted header data, to cause an     out-of-bounds read error, resulting in a denial of     service condition or the disclosure of memory contents.
    (CVE-2016-4542)

  - A flaw exists in PHP in the exif_process_IFD_in_JPEG()     function in exif.c due to improper validation of IFD     sizes. An unauthenticated, remote attacker can exploit     this, via crafted header data, to cause an out-of-bounds     read error, resulting in a denial of service condition     or the disclosure of memory contents. (CVE-2016-4543)

  - A man-in-the-middle vulnerability exists, known as     'httpoxy', in the Apache Tomcat, Apache HTTP Server, and     PHP components due to a failure to properly resolve     namespace conflicts in accordance with RFC 3875 section     4.1.18. The HTTP_PROXY environment variable is set based     on untrusted user data in the 'Proxy' header of HTTP     requests. The HTTP_PROXY environment variable is used by     some web client libraries to specify a remote proxy     server. A remote attacker can exploit this, via a     crafted 'Proxy' header in an HTTP request, to redirect     an application's internal HTTP traffic to an arbitrary     proxy server where it may be observed or manipulated.
    (CVE-2016-5385, CVE-2016-5387, CVE-2016-5388)

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

According to its banner, the version of OpenSSL on the remote host is 1.0.1 prior to 1.0.1t, or 1.0.2 prior to 1.0.2h. It is therefore affected by the following vulnerabilities :

 - A flaw exists in 'crypto/asn1/a_d2i_fp.c', which is triggered during the handling of large length fields in ASN.1 BIO. This may allow a remote attacker to exhaust memory resources, potentially crashing a process linked against the library.
 - A flaw exists in the 'aesni_cbc_hmac_sha1_cipher()' function in 'crypto/evp/e_aes_cbc_hmac_sha1.c' and 'aesni_cbc_hmac_sha256_cipher()' function in 'crypto/evp/e_aes_cbc_hmac_sha256.c'. The issue is triggered when a connection uses an AES CBC cipher and AES-NI is supported by the server. This may allow a MitM (Man-in-the-Middle) attacker to conduct a padding oracle attack to potentially decrypt traffic.
 - A flaw in the 'X509_NAME_oneline()' function in 'crypto/x509/x509_obj.c' that is triggered when handling overly long ASN1 strings. This may allow a remote attacker to potentially disclose arbitrary stack memory contents.
 - An overflow condition in the 'EVP_EncryptUpdate()' function in 'crypto/evp/evp_enc.c' is triggered when handling a large amount of input data after a previous call to the same function with a partial block. This may allow a context-dependent attacker to cause a heap-based buffer overflow, crashing a process linked against the library or potentially resulting in the execution of arbitrary code.
 - An overflow condition in the 'EVP_EncodeUpdate()' function in 'crypto/evp/encode.c' is triggered when handling a large amount of input data. This may allow a context-dependent attacker to cause a heap-based buffer overflow, crashing a process linked against the library or potentially resulting in the execution of arbitrary code.

ID	Name	Product	Family	Published	Updated	Severity
91058	Fedora 22 : openssl-1.0.1k-15.fc22 (2016-1e39d934ed)	Nessus	Fedora Local Security Checks	5/12/2016	1/11/2021	critical
91152	Oracle Linux 6 : openssl (ELSA-2016-0996)	Nessus	Oracle Linux Local Security Checks	5/16/2016	1/14/2021	critical
91541	Scientific Linux Security Update : openssl on SL6.x i386/x86_64 (20160510)	Nessus	Scientific Linux Local Security Checks	6/9/2016	1/14/2021	critical
93761	OracleVM 3.3 / 3.4 : openssl (OVMSA-2016-0135)	Nessus	OracleVM Local Security Checks	9/28/2016	1/4/2021	critical
94654	HP System Management Homepage < 7.6 Multiple Vulnerabilities (HPSBMU03653) (httpoxy)	Nessus	Web Servers	11/9/2016	4/11/2022	high
9390	OpenSSL 1.0.1 < 1.0.1t / 1.0.2 < 1.0.2h Multiple Vulnerabilities	Nessus Network Monitor	Web Servers	7/8/2016	3/6/2019	high

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