CVE-2023-5574: Xorg-x11-server: use-after-free bug in damagedestroy
First published: Wed Oct 18 2023(Updated: )
A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/xorg-server | <21.1.9 | 21.1.9 |
| X.Org X Server | >=1.13.0 | |
| Redhat Enterprise Linux | =7.0 |
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Reference Links
- https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1189
- https://lists.x.org/archives/xorg-announce/2023-October/003430.html
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2246139
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2244735#c0
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2247470
- https://access.redhat.com/errata/RHSA-2024:2298
- https://bugzilla.redhat.com/show_bug.cgi?id=2244735
- https://access.redhat.com/security/cve/CVE-2023-5574
Frequently Asked Questions
What is CVE-2023-5574?
CVE-2023-5574 is a use-after-free vulnerability found in xorg-x11-server-Xvfb.
What is the severity of CVE-2023-5574?
CVE-2023-5574 has a severity level of high (7).
How does CVE-2023-5574 affect xorg-x11-server-Xvfb?
CVE-2023-5574 affects xorg-x11-server-Xvfb with a very specific and legacy configuration (multi-screen setup with multiple protocol screens).
How do I fix CVE-2023-5574 in xorg-x11-server-Xvfb?
To fix CVE-2023-5574 in xorg-x11-server-Xvfb, update to version 21.1.9 or later.
Where can I find more information about CVE-2023-5574?
You can find more information about CVE-2023-5574 at the following references: [link1](https://access.redhat.com/security/cve/CVE-2023-5574), [link2](https://bugzilla.redhat.com/show_bug.cgi?id=2244735), [link3](https://lists.x.org/archives/xorg-announce/2023-October/003430.html).
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