Heap Out-of-Bounds Read in Libdisplay-info

Executive Summary

Libdisplay-info 0.4.0 has a heap out-of-bounds read flaw in the DisplayID v2 section parser. The issue occurs when parsing oversized data block lengths in the DisplayID v2 section. Attackers can exploit this by providing a maliciously crafted EDID from a compromised monitor, KVM, capture device, or file. This causes the parser to advance beyond the allocated EDID buffer, leading to crashes in applications.

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Detection Guidance

To detect this vulnerability, inspect systems using libdisplay-info 0.4.0 or affected applications. Check for crashes or memory corruption when processing EDID data from monitors, KVM switches, or capture devices. Monitor logs for heap out-of-bounds read errors. No specific commands are provided in the context.

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Impact Analysis

This vulnerability could cause applications relying on libdisplay-info to crash when processing a specially crafted EDID. If exploited via a malicious monitor or file, it may lead to denial-of-service conditions or potential information disclosure if sensitive data is read from memory.

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Compliance Impact

This vulnerability may impact compliance with GDPR and HIPAA by potentially exposing sensitive data through heap out-of-bounds reads. If exploited, attackers could access memory beyond the EDID buffer, potentially leaking confidential information processed by applications using libdisplay-info. This could violate data protection requirements under GDPR (e.g., Article 32 security of processing) and HIPAA (e.g., safeguards for protected health information).

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Mitigation Strategies

Update libdisplay-info to the latest version to patch the heap out-of-bounds read vulnerability in the DisplayID v2 section parser. Avoid using untrusted EDID sources from monitors, KVMs, or capture devices.

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