OpenSSL 1.0.1 < 1.0.1t Multiple Vulnerabilities

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote service is affected by multiple vulnerabilities.

Description :

According to its banner, the remote host is running a version of
OpenSSL 1.0.1 prior to 1.0.1t. It is, therefore, affected by the
following vulnerabilities :

- A heap buffer overflow condition exists 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 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)

- Flaws exist 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 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)

- An out-of-bounds read error exists in the
X509_NAME_oneline() function within file
crypto/x509/x509_obj.c when handling very long ASN1
strings. An unauthenticated, remote attacker can exploit
this to disclose the contents of stack memory.
(CVE-2016-2176)

See also :

https://www.openssl.org/news/secadv/20160503.txt
https://www.openssl.org/news/cl101.txt

Solution :

Upgrade to OpenSSL version 1.0.1t or later.

Risk factor :

Medium / CVSS Base Score : 5.8
(CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N)
CVSS Temporal Score : 4.5
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: Web Servers

Nessus Plugin ID: 90890 ()

Bugtraq ID: 87940
89744
89746
89757
89760

CVE ID: CVE-2016-2105
CVE-2016-2106
CVE-2016-2107
CVE-2016-2109
CVE-2016-2176

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