Ubuntu 12.04 LTS / 14.04 LTS : libvncserver vulnerabilities (USN-2365-1)

Ubuntu Security Notice (C) 2014-2016 Canonical, Inc. / NASL script (C) 2014-2016 Tenable Network Security, Inc.


Synopsis :

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

Description :

Nicolas Ruff discovered that LibVNCServer incorrectly handled memory
when being advertised large screen sizes by the server. If a user were
tricked into connecting to a malicious server, an attacker could use
this issue to cause a denial of service, or possibly execute arbitrary
code. (CVE-2014-6051, CVE-2014-6052)

Nicolas Ruff discovered that LibVNCServer incorrectly handled large
ClientCutText messages. A remote attacker could use this issue to
cause a server to crash, resulting in a denial of service.
(CVE-2014-6053)

Nicolas Ruff discovered that LibVNCServer incorrectly handled zero
scaling factor values. A remote attacker could use this issue to cause
a server to crash, resulting in a denial of service. (CVE-2014-6054)

Nicolas Ruff discovered that LibVNCServer incorrectly handled memory
in the file transfer feature. A remote attacker could use this issue
to cause a server to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2014-6055).

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 libvncserver0 package.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 5.5
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 77982 ()

Bugtraq ID: 70091
70092
70093
70094
70096

CVE ID: CVE-2014-6051
CVE-2014-6052
CVE-2014-6053
CVE-2014-6054
CVE-2014-6055

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