CVE-2002-2060 in Links
Summary
by MITRE
Buffer overflow in Links 2.0 pre4 allows remote attackers to crash client browsers and possibly execute arbitrary code via gamma tables in large 16-bit PNG images.
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Analysis
by VulDB Data Team • 07/08/2024
The vulnerability identified as CVE-2002-2060 represents a critical buffer overflow flaw discovered in Links 2.0 pre4 web browser software. This vulnerability specifically targets the handling of gamma tables within large 16-bit PNG image files, creating a dangerous condition where remote attackers can exploit the software's inadequate input validation mechanisms. The flaw exists in the image processing pipeline where the application fails to properly validate the size and structure of gamma table data contained within PNG metadata, leading to memory corruption when processing malformed image files.
The technical implementation of this vulnerability stems from improper bounds checking during the parsing of PNG gamma table information. When Links 2.0 encounters a 16-bit PNG image with oversized gamma tables, the application's buffer allocation routines fail to account for the actual data size, resulting in a classic stack-based buffer overflow condition. This memory corruption occurs because the software assumes a fixed buffer size for gamma table processing while encountering variable-length data that exceeds allocated memory boundaries. The vulnerability is particularly dangerous as it operates within the image rendering subsystem where user interaction is minimal, making exploitation both stealthy and effective.
The operational impact of CVE-2002-2060 extends beyond simple application crashes to potentially enable remote code execution on vulnerable systems. When exploited successfully, attackers can manipulate the program's execution flow by overwriting return addresses and control structures within the stack memory. This capability allows adversaries to inject and execute malicious code with the privileges of the affected user, potentially leading to full system compromise. The vulnerability affects client-side systems running Links 2.0 pre4, making web users susceptible to attacks through maliciously crafted PNG images hosted on compromised websites or delivered via social engineering campaigns.
Security professionals should note that this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and demonstrates the classic attack patterns associated with the attack technique T1203 from the MITRE ATT&CK framework. Organizations should implement immediate mitigations including updating to patched versions of Links 2.0, implementing strict image validation policies, and deploying network-based intrusion detection systems to monitor for suspicious PNG file transfers. Additionally, users should avoid downloading images from untrusted sources and consider disabling automatic image rendering in web browsers when encountering potentially malicious content. The vulnerability serves as a critical reminder of the importance of robust input validation and memory safety practices in client-side applications.