Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : openssl vulnerabilities (USN-2959-1)

Ubuntu Security Notice (C) 2016 Canonical, Inc. / NASL script (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

Huzaifa Sidhpurwala, Hanno Bock, and David Benjamin discovered that
OpenSSL incorrectly handled memory when decoding ASN.1 structures. A
remote attacker could use this issue to cause OpenSSL to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2016-2108)

Juraj Somorovsky discovered that OpenSSL incorrectly performed padding
when the connection uses the AES CBC cipher and the server supports
AES-NI. A remote attacker could possibly use this issue to perform a
padding oracle attack and decrypt traffic. (CVE-2016-2107)

Guido Vranken discovered that OpenSSL incorrectly handled large
amounts of input data to the EVP_EncodeUpdate() function. A remote
attacker could use this issue to cause OpenSSL to crash, resulting in
a denial of service, or possibly execute arbitrary code.
(CVE-2016-2105)

Guido Vranken discovered that OpenSSL incorrectly handled large
amounts of input data to the EVP_EncryptUpdate() function. A remote
attacker could use this issue to cause OpenSSL to crash, resulting in
a denial of service, or possibly execute arbitrary code.
(CVE-2016-2106)

Brian Carpenter discovered that OpenSSL incorrectly handled memory
when ASN.1 data is read from a BIO. A remote attacker could possibly
use this issue to cause memory consumption, resulting in a denial of
service. (CVE-2016-2109)

As a security improvement, this update also modifies OpenSSL behaviour
to reject DH key sizes below 1024 bits, preventing a possible
downgrade attack.

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

Solution :

Update the affected libssl1.0.0 package.

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: Ubuntu Local Security Checks

Nessus Plugin ID: 90887 ()

Bugtraq ID:

CVE ID: CVE-2016-2105
CVE-2016-2106
CVE-2016-2107
CVE-2016-2108
CVE-2016-2109

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