Debian Security Advisory
DLA-2369-1 libxml2 -- LTS security update
- Date Reported:
- 10 Sep 2020
- Affected Packages:
- Security database references:
- In the Debian bugtracking system: Bug 895245, Bug 862450, Bug 949583, Bug 969529, Bug 949582.
In Mitre's CVE dictionary: CVE-2017-8872, CVE-2017-18258, CVE-2018-14404, CVE-2018-14567, CVE-2019-19956, CVE-2019-20388, CVE-2020-7595, CVE-2020-24977.
- More information:
Several security vulnerabilities were corrected in libxml2, the GNOME XML library.
Global buffer-overflow in the htmlParseTryOrFinish function.
The xz_head function in libxml2 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.
A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs may be vulnerable to a denial of service attack.
If the option --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file.
The xmlParseBalancedChunkMemoryRecover function has a memory leak related to newDoc->oldNs.
A memory leak was found in the xmlSchemaValidateStream function of libxml2. Applications that use this library may be vulnerable to memory not being freed leading to a denial of service.
Infinite loop in xmlStringLenDecodeEntities can cause a denial of service.
Out-of-bounds read restricted to xmllint --htmlout.
For Debian 9 stretch, these problems have been fixed in version 2.9.4+dfsg1-2.2+deb9u3.
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