X.org X11 Server up to 21.1.11 ProcXIGetSelectedEvents heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in X.org X11 Server up to 21.1.11. The impacted element is the function ProcXIGetSelectedEvents. Performing a manipulation results in heap-based overflow. This vulnerability is known as CVE-2024-31080. Attacking locally is a requirement. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in X.org X11 Server up to 21.1.11. This affects the function ProcXIGetSelectedEvents. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at access.redhat.com. This vulnerability is uniquely identified as CVE-2024-31080 since 03/28/2024. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 210818 (RHEL 9 : xorg-x11-server (RHSA-2024:9122)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 21.1.12 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (210818) and EUVD (EUVD-2024-28991). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Windowing System Software

Vendor

• X.org

Name

• X11 Server

Version

• 21.1.0
• 21.1.1
• 21.1.2
• 21.1.3
• 21.1.4
• 21.1.5
• 21.1.6
• 21.1.7
• 21.1.8
• 21.1.9
• 21.1.10
• 21.1.11

License

• open-source

Website

• Vendor: https://www.x.org/

CPE 2.3info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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