USN-786-1: apr-util vulnerabilities

Ubuntu Security Notice USN-786-1

10th June, 2009

apr-util vulnerabilities

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software description

  • apr-util


Matthew Palmer discovered an underflow flaw in apr-util. An attacker could
cause a denial of service via application crash in Apache using a crafted
SVNMasterURI directive, .htaccess file, or when using mod_apreq2.
Applications using libapreq2 are also affected. (CVE-2009-0023)

It was discovered that the XML parser did not properly handle entity
expansion. A remote attacker could cause a denial of service via memory
resource consumption by sending a crafted request to an Apache server
configured to use mod_dav or mod_dav_svn. (CVE-2009-1955)

C. Michael Pilato discovered an off-by-one buffer overflow in apr-util when
formatting certain strings. For big-endian machines (powerpc, hppa and
sparc in Ubuntu), a remote attacker could cause a denial of service or
information disclosure leak. All other architectures for Ubuntu are
not considered to be at risk. (CVE-2009-1956)

Update instructions

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

Ubuntu 9.04:
libaprutil1 1.2.12+dfsg-8ubuntu0.1
Ubuntu 8.10:
libaprutil1 1.2.12+dfsg-7ubuntu0.1
Ubuntu 8.04 LTS:
libaprutil1 1.2.12+dfsg-3ubuntu0.1

To update your system, please follow these instructions:

After a standard system upgrade you need to restart any services that use
apr-util, such as Apache or svnserve, to effect the necessary changes.


CVE-2009-0023, CVE-2009-1955, CVE-2009-1956