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DebianDEBIAN:DLA-2369-1:E14AE
HistorySep 09, 2020 - 10:41 p.m.

[SECURITY] [DLA 2369-1] libxml2 security update

2020-09-0922:41:50
lists.debian.org
73

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

6.4 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:N/A:P

0.021 Low

EPSS

Percentile

88.7%


Debian LTS Advisory DLA-2369-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Markus Koschany
September 09, 2020 https://wiki.debian.org/LTS


Package : libxml2
Version : 2.9.4+dfsg1-2.2+deb9u3
CVE ID : CVE-2017-8872 CVE-2017-18258 CVE-2018-14404
CVE-2018-14567 CVE-2019-19956 CVE-2019-20388
CVE-2020-7595 CVE-2020-24977
Debian Bug : 895245 862450 949583 969529 949582

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.

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

How to protect your server from attacks?

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

6.4 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:N/A:P

0.021 Low

EPSS

Percentile

88.7%

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