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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: VulnerabilitiesAssignee: 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 gentoo-dev Security 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 gentoo-dev Security 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).