Ubuntu 12.04 LTS USN-1527-1 Critical Expat Denial of Service

ubuntu

August 10, 2012

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

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)

Topics Covered

security advisory critical Ubuntu update instructions Denial of Service service interruption Expat

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.