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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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