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Ubuntu Security Notice USN-1527-1

Ubuntu Security Notice USN-1527-1
Posted Aug 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1527-1 - It was discovered that Expat computed hash values without restricting the ability to trigger hash collisions predictably. If a user or application linked against Expat were tricked into opening a crafted XML file, an attacker could cause a denial of service by consuming excessive CPU resources. Tim Boddy discovered that Expat did not properly handle memory reallocation when processing XML files. If a user or application linked against Expat were tricked into opening a crafted XML file, an attacker could cause a denial of service by consuming excessive memory resources. This issue only affected Ubuntu 8.04 LTS, 10.04 LTS, 11.04 and 11.10. Various other issues were also addressed.

tags | advisory, denial of service
systems | linux, ubuntu
advisories | CVE-2012-0876, CVE-2012-1148, CVE-2012-0876, CVE-2012-1148
MD5 | df65e8959613da375d92a4a7be72b40c

Ubuntu Security Notice USN-1527-1

Change Mirror Download
Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-1527-1
August 10, 2012

expat 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:

Expat could be made to cause a denial of service by consuming excessive CPU
and memory resources.

Software Description:
- expat: XML parsing C library - example application

Details:

It was discovered that Expat computed hash values without restricting the
ability to trigger hash collisions predictably. If a user or application linked
against Expat were tricked into opening a crafted XML file, an attacker could
cause a denial of service by consuming excessive CPU resources. (CVE-2012-0876)

Tim Boddy discovered that Expat did not properly handle memory reallocation
when processing XML files. If a user or application linked against Expat were
tricked into opening a crafted XML file, an attacker could cause a denial of
service by consuming excessive memory resources. This issue only affected
Ubuntu 8.04 LTS, 10.04 LTS, 11.04 and 11.10. (CVE-2012-1148)

Update instructions:

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

Ubuntu 12.04 LTS:
lib64expat1 2.0.1-7.2ubuntu1.1
libexpat1 2.0.1-7.2ubuntu1.1
libexpat1-udeb 2.0.1-7.2ubuntu1.1

Ubuntu 11.10:
lib64expat1 2.0.1-7ubuntu3.11.10.1
libexpat1 2.0.1-7ubuntu3.11.10.1
libexpat1-udeb 2.0.1-7ubuntu3.11.10.1

Ubuntu 11.04:
lib64expat1 2.0.1-7ubuntu3.11.04.1
libexpat1 2.0.1-7ubuntu3.11.04.1
libexpat1-udeb 2.0.1-7ubuntu3.11.04.1

Ubuntu 10.04 LTS:
lib64expat1 2.0.1-7ubuntu1.1
libexpat1 2.0.1-7ubuntu1.1
libexpat1-udeb 2.0.1-7ubuntu1.1

Ubuntu 8.04 LTS:
lib64expat1 2.0.1-0ubuntu1.2
libexpat1 2.0.1-0ubuntu1.2
libexpat1-udeb 2.0.1-0ubuntu1.2

After a standard system upgrade you need to restart any applications linked
against Expat to effect the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1527-1
CVE-2012-0876, CVE-2012-1148

Package Information:
https://launchpad.net/ubuntu/+source/expat/2.0.1-7.2ubuntu1.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-7ubuntu3.11.10.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-7ubuntu3.11.04.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-7ubuntu1.1
https://launchpad.net/ubuntu/+source/expat/2.0.1-0ubuntu1.2

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