Bug 2244736 (CVE-2023-5380)
| Summary: | CVE-2023-5380 xorg-x11-server: Use-after-free bug in DestroyWindow | ||
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| Product: | [Other] Security Response | Reporter: | Patrick Del Bello <pdelbell> |
| Component: | vulnerability | Assignee: | Product Security <prodsec-ir-bot> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | security-response-team |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | xorg-server-21.1.9 | Doc Type: | If docs needed, set a value |
| Doc Text: |
A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in 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 within a window on one screen to the root window of the other screen and if the original window is destroyed followed by another window being destroyed.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 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: | 2246140, 2247469 | ||
| Bug Blocks: | 2242002 | ||
Created xorg-x11-server tracking bugs for this issue: Affects: fedora-all [bug 2246140] Created tigervnc tracking bugs for this issue: Affects: fedora-all [bug 2247469] This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2023:7428 https://access.redhat.com/errata/RHSA-2023:7428 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2024:2169 https://access.redhat.com/errata/RHSA-2024:2169 This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2024:2298 https://access.redhat.com/errata/RHSA-2024:2298 |
This vulnerability requires a legacy multi-screen setup with multiple protocol screens ("Zaphod"). If the pointer is warped from one screen to the root window of the other screen, the enter/leave code may retain a reference to the previous pointer window. Destroying this window leaves that reference in place, other windows may then trigger a use-after-free bug when they are destroyed. This bug can be triggered only under very specific conditions, in particular it requires an XWarpPointer call and that the pointer never enters a client window on the other screen. Reference: https://lists.x.org/archives/xorg-announce/2023-October/003430.html