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Ubuntu Security Notice USN-2982-1

Ubuntu Security Notice USN-2982-1
Posted May 17, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2982-1 - Hanno Boeck discovered that Libksba incorrectly handled decoding certain BER data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. Hanno Boeck discovered that Libksba incorrectly handled decoding certain BER data. An attacker could use this issue to cause Libksba to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2016-4353, CVE-2016-4354, CVE-2016-4355, CVE-2016-4356, CVE-2016-4574, CVE-2016-4579
MD5 | a3f49a34854370cd11b198fe180bc8be

Ubuntu Security Notice USN-2982-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2982-1
May 17, 2016

libksba vulnerabilities
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Libksba could be made to crash or run programs if it decoded specially
crafted data.

Software Description:
- libksba: X.509 and CMS support library

Details:

Hanno B=C3=B6ck discovered that Libksba incorrectly handled decoding certain BER
data. An attacker could use this issue to cause Libksba to crash, resulting
in a denial of service. This issue only applied to Ubuntu 12.04 LTS and
Ubuntu 14.04 LTS. (CVE-2016-4353)

Hanno B=C3=B6ck discovered that Libksba incorrectly handled decoding certain BER
data. An attacker could use this issue to cause Libksba to crash, resulting
in a denial of service, or possibly execute arbitrary code. This issue only
applied to Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4354,
CVE-2016-4355)

Hanno B=C3=B6ck discovered that Libksba incorrectly handled incorrect utf-8
strings when decoding certain DN data. An attacker could use this issue to
cause Libksba to crash, resulting in a denial of service, or possibly
execute arbitrary code. This issue only applied to Ubuntu 12.04 LTS and
Ubuntu 14.04 LTS. (CVE-2016-4356)

Pascal Cuoq discovered that Libksba incorrectly handled incorrect utf-8
strings when decoding certain DN data. An attacker could use this issue to
cause Libksba to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2016-4574)

Pascal Cuoq discovered that Libksba incorrectly handled decoding certain
data. An attacker could use this issue to cause Libksba to crash, resulting
in a denial of service. (CVE-2016-4579)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS:
libksba8 1.3.3-1ubuntu0.16.04.1

Ubuntu 15.10:
libksba8 1.3.3-1ubuntu0.15.10.1

Ubuntu 14.04 LTS:
libksba8 1.3.0-3ubuntu0.14.04.2

Ubuntu 12.04 LTS:
libksba8 1.2.0-2ubuntu0.2

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-2982-1
CVE-2016-4353, CVE-2016-4354, CVE-2016-4355, CVE-2016-4356,
CVE-2016-4574, CVE-2016-4579

Package Information:
https://launchpad.net/ubuntu/+source/libksba/1.3.3-1ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/libksba/1.3.3-1ubuntu0.15.10.1
https://launchpad.net/ubuntu/+source/libksba/1.3.0-3ubuntu0.14.04.2
https://launchpad.net/ubuntu/+source/libksba/1.2.0-2ubuntu0.2

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