Debian LTS: Security Advisory for libxml2 (DLA-2369-1)

Published: 2020-09-10 07:28:40
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:P

Summary:
The remote host is missing an update for the 'libxml2' Linux Distribution Package(s) announced via the DLA-2369-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
Several security vulnerabilities were corrected in libxml2, the GNOME XML library. CVE-2017-8872 Global buffer-overflow in the htmlParseTryOrFinish function. CVE-2017-18258 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. CVE-2018-14404 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. CVE-2018-14567 If the option --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file. CVE-2019-19956 The xmlParseBalancedChunkMemoryRecover function has a memory leak related to newDoc->oldNs. CVE-2019-20388 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. CVE-2020-7595 Infinite loop in xmlStringLenDecodeEntities can cause a denial of service. CVE-2020-24977 Out-of-bounds read restricted to xmllint --htmlout.

Affected Versions:
'libxml2' Linux Distribution Package(s) on Debian Linux.

Recommendations:
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 Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)

https://nvd.nist.gov/vuln/detail/CVE-2017-18258
https://nvd.nist.gov/vuln/detail/CVE-2017-8872
https://nvd.nist.gov/vuln/detail/CVE-2018-14404
https://nvd.nist.gov/vuln/detail/CVE-2018-14567
https://nvd.nist.gov/vuln/detail/CVE-2019-19956
https://nvd.nist.gov/vuln/detail/CVE-2019-20388
https://nvd.nist.gov/vuln/detail/CVE-2020-24977
https://nvd.nist.gov/vuln/detail/CVE-2020-7595

References:

https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
https://security-tracker.debian.org/tracker/DLA-2369-1
https://bugs.debian.org/895245
https://bugs.debian.org/862450
https://bugs.debian.org/949583
https://bugs.debian.org/969529
https://bugs.debian.org/949582

Severity
Medium
CVSS Score
6.4
Published
2020-09-10
Modified
2020-09-10
Category
Debian Local Security Checks

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