libxml2 - several

Many security problems have been fixed in libxml2, a popular library to handle
XML data files.

• CVE-2011-3919:

JĂźri Aedla discovered a heap-based buffer overflow that allows remote attackers
to cause a denial of service or possibly have unspecified other impact via
unknown vectors.

• CVE-2011-0216:

An Off-by-one error have been discovered that allows remote attackers to
execute arbitrary code or cause a denial of service.

• CVE-2011-2821:

A memory corruption (double free) bug has been identified in libxml2’s XPath
engine. Through it, it is possible for an attacker to cause a denial of
service or possibly have unspecified other impact. This vulnerability does not
affect the oldstable distribution (lenny).

• CVE-2011-2834:

Yang Dingning discovered a double free vulnerability related to XPath handling.

• CVE-2011-3905:

An out-of-bounds read vulnerability had been discovered, which allows remote
attackers to cause a denial of service.

For the oldstable distribution (lenny), this problem has been fixed in
version 2.6.32.dfsg-5+lenny5.

For the stable distribution (squeeze), this problem has been fixed in
version 2.7.8.dfsg-2+squeeze2.

For the testing distribution (wheezy), this problem has been fixed in
version 2.7.8.dfsg-7.

For the unstable distribution (sid), this problem has been fixed in
version 2.7.8.dfsg-7.

We recommend that you upgrade your libxml2 packages.