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USN-786-1: apr-util vulnerabilities

10 June 2009

apr-util vulnerabilities




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 versions:

Ubuntu 9.04
Ubuntu 8.10
Ubuntu 8.04

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.

Related notices

  • USN-787-1: libapr0, apache2-common, apache2-mpm-perchild, apache2-mpm-worker, apache2-mpm-event, apache2, apache2-mpm-prefork, apache2.2-common