Heap Buffer Overflow in libXfont2 Due to PCF Parsing

Executive Summary

This vulnerability is a heap buffer overflow caused by missing size checking in the property buffer when parsing PCF files in the libXfont2 library's ComputeScaledProperties() function. It affects versions of libXfont2 before 2.0.8.

An attacker who has authenticated access as an X client can exploit this flaw to execute arbitrary code within the X server.

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Impact Analysis

Exploitation of this vulnerability can allow an attacker with authenticated access to the X server to execute arbitrary code with the privileges of the X server process.

This can lead to a complete compromise of the affected system, including unauthorized access, data modification, or denial of service.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade libXfont2 to version 2.0.8 or later, where the heap buffer overflow issue in ComputeScaledProperties() has been fixed.

Additionally, restrict or monitor the use of authenticated X clients to prevent attackers from loading specially crafted PCF fonts that could exploit this vulnerability.

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