Applications using libxslt could be made to crash or run programs as your login if they processed a specially crafted file.

=========================================================================Ubuntu Security Notice USN-1595-1
October 04, 2012

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

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

Applications using libxslt could be made to crash or run programs as your
login if they processed a specially crafted file.

Software Description:
- libxslt: XSLT processing library

Details:

Chris Evans discovered that libxslt incorrectly handled generate-id XPath
functions. If a user or automated system were tricked into processing a
specially crafted XSLT document, a remote attacker could obtain potentially
sensitive information. This issue only affected Ubuntu 8.04 LTS, Ubuntu
10.04 LTS and Ubuntu 11.04. (CVE-2011-1202)

It was discovered that libxslt incorrectly parsed certain patterns. If a
user or automated system were tricked into processing a specially crafted
XSLT document, a remote attacker could cause libxslt to crash, causing a
denial of service. (CVE-2011-3970)

Nicholas Gregoire discovered that libxslt incorrectly handled unexpected
DTD nodes. If a user or automated system were tricked into processing a
specially crafted XSLT document, a remote attacker could cause libxslt to
crash, causing a denial of service. (CVE-2012-2825)

Nicholas Gregoire discovered that libxslt incorrectly managed memory. If a
user or automated system were tricked into processing a specially crafted
XSLT document, a remote attacker could cause libxslt to crash, causing a
denial of service. (CVE-2012-2870)

Nicholas Gregoire discovered that libxslt incorrectly handled certain
transforms. If a user or automated system were tricked into processing a
specially crafted XSLT document, a remote attacker could cause libxslt to
crash, causing a denial of service, or possibly execute arbitrary code.
(CVE-2012-2871)

Cris Neckar discovered that libxslt incorrectly managed memory. If a user
or automated system were tricked into processing a specially crafted XSLT
document, a remote attacker could cause libxslt to crash, causing a denial
of service, or possibly execute arbitrary code. (CVE-2012-2893)

Update instructions:

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

Ubuntu 12.04 LTS:
  libxslt1.1                      1.1.26-8ubuntu1.2

Ubuntu 11.10:
  libxslt1.1                      1.1.26-7ubuntu0.1

Ubuntu 11.04:
  libxslt1.1                      1.1.26-6ubuntu0.1

Ubuntu 10.04 LTS:
  libxslt1.1                      1.1.26-1ubuntu1.1

Ubuntu 8.04 LTS:
  libxslt1.1                      1.1.22-1ubuntu1.3

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

References:
  
  CVE-2011-1202, CVE-2011-3970, CVE-2012-2825, CVE-2012-2870,
  CVE-2012-2871, CVE-2012-2893

Package Information:
  https://launchpad.net/ubuntu/+source/libxslt/1.1.26-8ubuntu1.2
  https://launchpad.net/ubuntu/+source/libxslt/1.1.26-7ubuntu0.1
  https://launchpad.net/ubuntu/+source/libxslt/1.1.26-6ubuntu0.1
  https://launchpad.net/ubuntu/+source/libxslt/1.1.26-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/libxslt/1.1.22-1ubuntu1.3