AIX OpenSSL Advisory : openssl_advisory20.asc

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


Synopsis :

The remote AIX host has a version of OpenSSL installed that is
affected by multiple vulnerabilities.

Description :

The version of OpenSSL installed on the remote AIX host is 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)

- A remote code execution vulnerability exists in the
ASN.1 encoder due to an underflow condition that occurs
when attempting to encode the value zero represented as
a negative integer. An unauthenticated, remote attacker
can exploit this to corrupt memory, resulting in the
execution of arbitrary code. (CVE-2016-2108)

- 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 :

http://aix.software.ibm.com/aix/efixes/security/openssl_advisory20.asc
https://www.openssl.org/news/secadv/20160503.txt

Solution :

A fix is available and can be downloaded from the IBM AIX website.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: AIX Local Security Checks

Nessus Plugin ID: 92323 ()

Bugtraq ID: 87940
89744
89746
89752
89757

CVE ID: CVE-2016-2105
CVE-2016-2106
CVE-2016-2108
CVE-2016-2109
CVE-2016-2176

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