CVE-2006-6960 in Spy Sweeper
Summary
by MITRE
The Compression Sweep feature in WebRoot Spy Sweeper 4.5.9 and earlier does not handle non-ZIP archives, which allows remote attackers to bypass the malware detection via files with (1) RAR, (2) GZ, (3) TAR, (4) CAB, or (5) ACE compression.
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Analysis
by VulDB Data Team • 10/06/2017
The vulnerability identified as CVE-2006-6960 affects WebRoot Spy Sweeper version 4.5.9 and earlier, specifically within its Compression Sweep feature. This flaw represents a significant security weakness in endpoint protection software that directly impacts malware detection capabilities. The issue stems from the software's inability to properly process and scan non-ZIP archive formats, creating a bypass mechanism that malicious actors can exploit to evade detection. The affected compression formats include RAR, GZ, TAR, CAB, and ACE archives, each representing common file packaging methods used in various operating systems and applications. This vulnerability demonstrates a classic case of incomplete input validation and inadequate archive handling within security software, where the system fails to account for the full spectrum of archive types that could be used to conceal malicious content.
The technical flaw manifests in how the Compression Sweep feature processes compressed files during malware scanning operations. When encountering non-ZIP archives, the software either fails to decompress them entirely or does not properly scan their contents, leaving potential threats undetected. This represents a failure in the software's threat detection engine and highlights a critical gap in the security validation process. The vulnerability operates at the application layer and can be classified under CWE-427 Uncontrolled Search Path Element, as the software does not properly validate or handle all supported archive formats. Attackers can leverage this weakness by packaging malicious payloads within these unsupported archive types, knowing that the security software will not adequately scan them for threats, effectively creating a blind spot in the protection mechanism.
The operational impact of this vulnerability extends beyond simple malware evasion, as it undermines the fundamental trust users place in endpoint protection software. Organizations relying on WebRoot Spy Sweeper for security monitoring face a significant risk of undetected malware infections, potentially leading to data breaches, system compromise, and extended attack lifecycles. The vulnerability enables attackers to bypass security controls through simple file packaging techniques, requiring no advanced exploitation methods or deep system knowledge. This makes the attack surface more accessible to threat actors with varying skill levels and increases the probability of successful infiltration. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1070.004 Indicator Removal on Host and T1027 Obfuscated Files or Information, as attackers can use compression to hide malicious files from detection mechanisms.
Mitigation strategies for this vulnerability should include immediate software updates to versions that properly support all standard archive formats, comprehensive testing of the updated software's archive handling capabilities, and implementation of additional detection layers such as network-based intrusion detection systems or sandboxing solutions. Organizations should also consider implementing file type restrictions at network boundaries and maintaining multiple independent security solutions to provide defense in depth. The vulnerability underscores the importance of comprehensive testing of security software against various file formats and compression types, as well as the need for continuous monitoring and updating of security tools to address emerging threats and gaps in protection coverage.