753773 – (CVE-2020-26950) <www-client/firefox{,-bin}-{78.4.1, 82.0.3}: Use-after-free via MCallGetProperty opcode (CVE-2020-26950)

Bug 753773 (CVE-2020-26950) - <www-client/firefox{,-bin}-{78.4.1, 82.0.3}: Use-after-free via MCallGetProperty opcode (CVE-2020-26950)

Summary: <www-client/firefox{,-bin}-{78.4.1, 82.0.3}: Use-after-free via MCallGetPrope...

Status:	RESOLVED FIXED

Alias:	CVE-2020-26950

Product:	Gentoo Security
Classification:	Unclassified
Component:	Vulnerabilities (show other bugs)
Hardware:	All Linux

Importance:	Normal major (vote)
Assignee:	Gentoo Security

URL:	https://www.mozilla.org/en-US/securit...
Whiteboard:	A2 [glsa+ cve]
Keywords:

Depends on:
Blocks:

Reported:	2020-11-09 20:02 UTC by Sam James
Modified:	2020-11-11 03:49 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

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Description Sam James archtester

2020-11-09 20:02:21 UTC

Summary: Write side effects in MCallGetProperty opcode not accounted for

Description:
"In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition."

Comment 1 Sam James archtester

2020-11-09 21:13:42 UTC

For observers: note that the appropriate versions have already been stabilised and we're just pending a GLSA now.

Comment 2 GLSAMaker/CVETool Bot gentoo-dev

2020-11-11 03:49:50 UTC

This issue was resolved and addressed in
 GLSA 202011-07 at https://security.gentoo.org/glsa/202011-07
by GLSA coordinator Sam James (sam_c).