Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : libssh vulnerabilities (USN-2912-1)

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 :

Mariusz Ziulek discovered that libssh incorrectly handled certain
packets. A remote attacker could possibly use this issue to cause
libssh to crash, resulting in a denial of service. (CVE-2015-3146)

Aris Adamantiadis discovered that libssh incorrectly generated
ephemeral secret keys of 128 bits instead of the recommended 1024 or
2048 bits when using the diffie-hellman-group1 and
diffie-hellman-group14 methods. If a remote attacker were able to
perform a man-in-the-middle attack, this flaw could be exploited to
view sensitive information. (CVE-2016-0739).

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 libssh-4 package.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 3.7
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 88930 ()

Bugtraq ID:

CVE ID: CVE-2015-3146
CVE-2016-0739

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