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Ubuntu: Security update for Perl

It was discovered that the decode_xs function in the Encode module is vulnerable to a heap-based buffer overflow via a crafted Unicode string. An attacker could use this overflow to cause a denial of service. It was discovered that the ‘new’ constructor in the Digest module is vulnerable to an eval injection. An attacker could use this to execute arbitrary code. It was discovered that Perl’s ‘x’ string repeat operator is vulnerable to a heap-based buffer overflow. An attacker could use this to execute arbitrary code.

Ryo Anazawa discovered that the CGI.pm module does not properly escape newlines in Set-Cookie or P3P (Platform for Privacy Preferences Project) headers. An attacker could use this to inject arbitrary headers into responses from applications that use CGI.pm.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1643-1
November 30, 2012

perl vulnerabilities
==========================================================================

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

Perl programs could be made to crash or run programs if they receive
specially crafted network traffic or other input.

Software Description:
- perl: Larry Wall's Practical Extraction and Report Language

Details:

It was discovered that the decode_xs function in the Encode module is
vulnerable to a heap-based buffer overflow via a crafted Unicode string.
An attacker could use this overflow to cause a denial of service.
(CVE-2011-2939)

It was discovered that the 'new' constructor in the Digest module is
vulnerable to an eval injection. An attacker could use this to execute
arbitrary code. (CVE-2011-3597)

It was discovered that Perl's 'x' string repeat operator is vulnerable
to a heap-based buffer overflow. An attacker could use this to execute
arbitrary code. (CVE-2012-5195)

Ryo Anazawa discovered that the CGI.pm module does not properly escape
newlines in Set-Cookie or P3P (Platform for Privacy Preferences Project)
headers. An attacker could use this to inject arbitrary headers into
responses from applications that use CGI.pm. (CVE-2012-5526)

Update instructions:

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

Ubuntu 12.10:
 perl                            5.14.2-13ubuntu0.1

Ubuntu 12.04 LTS:
 perl                            5.14.2-6ubuntu2.2

Ubuntu 11.10:
 perl                            5.12.4-4ubuntu0.1

Ubuntu 10.04 LTS:
 perl                            5.10.1-8ubuntu2.2

Ubuntu 8.04 LTS:
 perl                            5.8.8-12ubuntu0.7

Perl programs need to be restarted after a standard system update to
make all the necessary changes.

References:
 http://www.ubuntu.com/usn/usn-1643-1
 CVE-2011-2939, CVE-2011-3597, CVE-2012-5195, CVE-2012-5526

Package Information:
 https://launchpad.net/ubuntu/+source/perl/5.14.2-13ubuntu0.1
 https://launchpad.net/ubuntu/+source/perl/5.14.2-6ubuntu2.2
 https://launchpad.net/ubuntu/+source/perl/5.12.4-4ubuntu0.1
 https://launchpad.net/ubuntu/+source/perl/5.10.1-8ubuntu2.2
 https://launchpad.net/ubuntu/+source/perl/5.8.8-12ubuntu0.7
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