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Debian LTS Advisory DLA-3172-1                [email protected]
https://www.debian.org/lts/security/                      Markus Koschany
October 30, 2022                              https://wiki.debian.org/LTS
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Package        : libxml2
Version        : 2.9.4+dfsg1-7+deb10u5
CVE ID         : CVE-2022-40303 CVE-2022-40304
Debian Bug     : 1022224 1022225

It was discovered that libxml2, the GNOME XML library, was vulnerable to
integer overflows and memory corruption.

CVE-2022-40303

     Parsing a XML document with the XML_PARSE_HUGE option enabled can result
     in an integer overflow because safety checks were missing in some
     functions. Also, the xmlParseEntityValue function did not have any length
     limitation.

CVE-2022-40304

     When a reference cycle is detected in the XML entity cleanup function the
     XML entity data can be stored in a dictionary. In this case, the
     dictionary becomes corrupted resulting in logic errors, including memory
     errors like double free.

For Debian 10 buster, these problems have been fixed in version
2.9.4+dfsg1-7+deb10u5.

We recommend that you upgrade your libxml2 packages.

For the detailed security status of libxml2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libxml2

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS