Stack-based Buffer Overflow in GCC libstdc++

Executive Summary

This vulnerability is a stack-based buffer overflow in GCC's libstdc++. When an application extracts wide-character data into a bitset, the internal stack memory allocation fails to account for character size and alignment. This can lead to a buffer overflow, potentially causing denial of service (DoS) or, in rare cases, arbitrary code execution.

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Detection Guidance

Detecting this vulnerability requires checking if your system uses GCC libstdc++ with the affected bitset stream extraction functionality. Inspect applications that process wide-character streams into bitsets. Use commands like 'rpm -q libstdc++' or 'apt list --installed | grep libstdc++' to verify library versions. Monitor for crashes in applications handling wide-character input.

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Impact Analysis

The impact depends on whether your application processes untrusted wide-character input into a bitset. If so, an attacker could trigger a DoS by supplying crafted input. The risk is limited because this design pattern is uncommon in standard enterprise applications.

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Mitigation Strategies

Since no official patches are available, avoid using applications that extract untrusted wide-character input into bitsets. If possible, disable such functionality in affected applications. Monitor Red Hat's Bugzilla and security advisories for updates. Consider upgrading to supported versions once fixes are released.

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