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Buffer Over-read Affecting xorg-x11-server-Xephyr package, versions <0:1.20.11-26.el9

Severity

 Recommended
medium

Based on AlmaLinux security rating

    Threat Intelligence

    EPSS
    0.05% (19th percentile)

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  • Snyk ID SNYK-ALMALINUX9-XORGX11SERVERXEPHYR-8383721
  • published 18 Nov 2024
  • disclosed 12 Nov 2024
Report a new vulnerability Found a mistake?

Introduced: 12 Nov 2024

New CVE-2024-31080 Open this link in a new tab
CWE-126 Open this link in a new tab

How to fix?

Upgrade AlmaLinux:9 xorg-x11-server-Xephyr to version 0:1.20.11-26.el9 or higher.
This issue was patched in ALSA-2024:9122.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xorg-x11-server-Xephyr package and not the xorg-x11-server-Xephyr package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

A heap-based buffer over-read vulnerability was found in the X.org server's ProcXIGetSelectedEvents() function. This issue occurs when byte-swapped length values are used in replies, potentially leading to memory leakage and segmentation faults, particularly when triggered by a client with a different endianness. This vulnerability could be exploited by an attacker to cause the X server to read heap memory values and then transmit them back to the client until encountering an unmapped page, resulting in a crash. Despite the attacker's inability to control the specific memory copied into the replies, the small length values typically stored in a 32-bit integer can result in significant attempted out-of-bounds reads.

References

CVSS Scores

version 3.1
Expand this section

SUSE

7.6 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    Low
  • Integrity (I)
    Low
  • Availability (A)
    High
Expand this section

Red Hat

7.3 high