Bug 1944167 (CVE-2021-3472) - CVE-2021-3472 xorg-x11-server: XChangeFeedbackControl integer underflow leads to privilege escalation
Summary: CVE-2021-3472 xorg-x11-server: XChangeFeedbackControl integer underflow leads...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-3472
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1944956 1944957 1944958 1949217
Blocks: 1944094 1944169
TreeView+ depends on / blocked
 
Reported: 2021-03-29 13:02 UTC by msiddiqu
Modified: 2022-04-17 21:15 UTC (History)
10 users (show)

Fixed In Version: xorg-x11-server 1.20.11
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in xorg-x11-server. An interger underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2021-05-19 14:33:40 UTC
Embargoed:

Attachments (Terms of Use)

Description msiddiqu 2021-03-29 13:02:59 UTC 
A vulnerability was found affecting X.Org-Server, where integer underflow exist in xserver, ProcXChangeFeedbackControl() leading to local privilege escalation
Comment 1 msiddiqu 2021-03-29 13:03:02 UTC 
Acknowledgments:

Name: Trend MicJan-Niklas Sohnro Zero Day Initiative (Trend Micro Zero Day Initiative)
Comment 3 Huzaifa S. Sidhpurwala 2021-03-31 05:21:21 UTC 
Statement:

Xorg server does not run with root  privileges in Red Hat Enterprise Linux 8, therefore this flaw has been rated as having moderate impact for Red Hat Enterprise linux 8.
Comment 4 Guilherme de Almeida Suckevicz 2021-04-13 17:50:37 UTC 
Created xorg-x11-server tracking bugs for this issue:

Affects: fedora-all [bug 1949217]
Comment 5 Huzaifa S. Sidhpurwala 2021-04-14 03:40:07 UTC 
Upstream commit: https://gitlab.freedesktop.org/xorg/xserver/-/commit/7aaf54a1884f71dc363f0b884e57bcb67407a6cd
Comment 6 Huzaifa S. Sidhpurwala 2021-04-14 03:40:10 UTC 
External References:

https://lists.x.org/archives/xorg-announce/2021-April/003080.html
Comment 7 errata-xmlrpc 2021-05-19 10:53:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2021:2033 https://access.redhat.com/errata/RHSA-2021:2033
Comment 8 Product Security DevOps Team 2021-05-19 14:33:40 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-3472
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