Bug 1933602 (CVE-2020-29074)

Summary:	CVE-2020-29074 x11vnc: insecure permissions on shm
Product:	[Other] Security Response	Reporter:	msiddiqu
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	pahan, ppisar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-03-01 13:02:08 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1933603, 1933604
Bug Blocks:

Description msiddiqu 2021-03-01 08:51:17 UTC

scan.c in x11vnc 0.9.16 uses IPC_CREAT|0777 in shmget calls, which allows access by actors other than the current user.

References:


https://github.com/LibVNC/x11vnc/commit/69eeb9f7baa14ca03b16c9de821f9876def7a36a
https://lists.debian.org/debian-lts-announce/2020/12/msg00018.html
https://www.debian.org/security/2020/dsa-4799

Comment 1 msiddiqu 2021-03-01 08:52:45 UTC

Created x11vnc tracking bugs for this issue:

Affects: epel-all [bug 1933604]
Affects: fedora-all [bug 1933603]

Comment 2 Product Security DevOps Team 2021-03-01 13:02:08 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.