CVE-2019-19956

Publication date 24 December 2019

Last updated 24 July 2024

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libxml2	20.04 LTS focal	Fixed 2.9.10+dfsg-1ubuntu2
	19.10 eoan	Fixed 2.9.4+dfsg1-7ubuntu3.1
	19.04 disco	Ignored end of life
	18.04 LTS bionic	Fixed 2.9.4+dfsg1-6.1ubuntu1.3
	16.04 LTS xenial	Fixed 2.9.3+dfsg1-1ubuntu0.7
	14.04 LTS trusty	Fixed 2.9.1+dfsg1-3ubuntu4.13+esm1 Ubuntu Pro

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Notes

ccdm94

the fix for this issue, made available with commit 5a02583c, was reverted in version 2.9.11 with commit a0a8059b, since it seems like the fix introduced various memory issues in libxml2. More information regarding this choice made by upstream can be seen at: https://gitlab.gnome.org/GNOME/libxml2/-/issues/161

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libxml2	Upstream: 5a02583

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-4274-1
libxml2 vulnerabilities
10 February 2020