[USN-3393-2] ClamAV vulnerabilities

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3393-2
August 17, 2017

clamav vulnerabilities
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in ClamAV.

Software Description:
- clamav: Anti-virus utility for Unix

Details:

USN-3393-1 fixed several vulnerabilities in ClamAV. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 It was discovered that ClamAV incorrectly handled parsing certain 
 e- mail messages. A remote attacker could possibly use this issue to
 cause ClamAV to crash, resulting in a denial of service. 
 (CVE-2017-6418)
 
 It was discovered that ClamAV incorrectly handled certain malformed
 CHM files. A remote attacker could use this issue to cause ClamAV to
 crash, resulting in a denial of service, or possibly execute arbitrary
 code. This issue only affected Ubuntu 14.04 LTS. In the default
 installation, attackers would be isolated by the ClamAV AppArmor
 profile. (CVE-2017-6419)
 
 It was discovered that ClamAV incorrectly handled parsing certain PE
 files with WWPack compression. A remote attacker could possibly use
 this issue to cause ClamAV to crash, resulting in a denial of service.
 (CVE-2017-6420)

Update instructions:

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

Ubuntu 12.04 ESM:
  clamav                          0.99.2+addedllvm-0ubuntu0.12.04.2

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

References:
  https://www.ubuntu.com/usn/usn-3393-2
  https://www.ubuntu.com/usn/usn-3393-1
  CVE-2017-6418, CVE-2017-6419, CVE-2017-6420
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