Bug 753773 (CVE-2020-26950)

Summary:	<www-client/firefox{,-bin}-{78.4.1, 82.0.3}: Use-after-free via MCallGetProperty opcode (CVE-2020-26950)
Product:	Gentoo Security	Reporter:	Sam James <sam>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	major	CC:	mozilla
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://www.mozilla.org/en-US/security/advisories/mfsa2020-49/
Whiteboard:	A2 [glsa+ cve]
Package list:		Runtime testing required:	---

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).