CVE-2005-4786 in vrAZMain.dll
Summary
by MITRE
Buffer overflow in the archive decompression library (vrAZMain.dll 5.8.22.137), as used in HAURI anti-virus products including (1) ViRobot Expert 4.0, (2) ViRobot Advanced Server, and (3) HAURI LiveCall, allows user-assisted attackers to execute arbitrary code via an ALZ archive containing a file with a long filename.
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Analysis
by VulDB Data Team • 07/16/2018
The vulnerability identified as CVE-2005-4786 represents a critical buffer overflow condition within the vrAZMain.dll decompression library component that forms part of several HAURI anti-virus products. This flaw exists in the handling of ALZ archive files and specifically targets the processing of filenames that exceed normal length parameters. The affected software versions include ViRobot Expert 4.0, ViRobot Advanced Server, and HAURI LiveCall, all of which utilize the vulnerable decompression library. The vulnerability stems from inadequate bounds checking during the extraction process, where the software fails to properly validate the length of filenames contained within compressed archives before attempting to copy them into fixed-size memory buffers. This fundamental design flaw creates an exploitable condition that can be triggered through carefully crafted malicious archives.
The technical exploitation of this vulnerability occurs when a user or automated process attempts to decompress an ALZ archive containing a file with an excessively long filename. The decompression library in vrAZMain.dll does not properly validate the length of the filename before copying it into a predetermined memory buffer, resulting in a buffer overflow condition. This overflow allows an attacker to overwrite adjacent memory locations, potentially corrupting program execution flow or injecting malicious code. The attack requires user interaction since the malicious archive must be processed by the vulnerable software, making it a user-assisted remote code execution vulnerability. The flaw falls under CWE-121, which describes heap-based buffer overflow conditions, and demonstrates poor input validation practices that violate secure coding principles. From an operational perspective, this vulnerability creates a significant risk for organizations relying on these specific HAURI products, as successful exploitation could result in complete system compromise.
The impact of this vulnerability extends beyond simple code execution, as it represents a serious security weakness that could enable attackers to gain unauthorized access to systems running the affected software. The buffer overflow condition creates opportunities for privilege escalation attacks, where an attacker could potentially execute code with the privileges of the compromised application. The vulnerability also demonstrates weaknesses in software supply chain security, as it affects multiple products from the same vendor, suggesting broader architectural issues in the development lifecycle. From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary commands. Organizations using these products face potential data breaches, system infiltration, and lateral movement opportunities if the vulnerability remains unpatched. The vulnerability's exploitation requires minimal sophistication, making it particularly dangerous as it could be leveraged by attackers with limited technical expertise. Security practitioners should consider this vulnerability as part of broader defensive strategies, implementing network segmentation, application whitelisting, and regular security assessments to prevent exploitation. The affected products should be immediately updated to versions that address this buffer overflow condition, with proper vulnerability management processes established to prevent similar issues in the future.