CVE-2010-0135 in Keyview Filter Sdk
Summary
by MITRE
Heap-based buffer overflow in the WordPerfect 5.x reader (wosr.dll), as used in Autonomy KeyView 10.4 and 10.9 and possibly other products, allows remote attackers to execute arbitrary code via unspecified vectors related to "data blocks."
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Analysis
by VulDB Data Team • 09/23/2021
The vulnerability identified as CVE-2010-0135 represents a critical heap-based buffer overflow flaw within the WordPerfect 5.x reader component known as wosr.dll. This vulnerability resides within Autonomy KeyView versions 10.4 and 10.9, though it may affect other products utilizing the same underlying library. The flaw manifests when processing data blocks within WordPerfect documents, creating a condition where maliciously crafted input can overwrite adjacent memory locations in the heap allocation space. Such buffer overflow conditions typically occur when an application writes more data to a buffer than it can accommodate, leading to memory corruption that adversaries can exploit to execute arbitrary code.
The technical exploitation of this vulnerability leverages the fundamental weakness in memory management practices within the WordPerfect 5.x reader implementation. When the wosr.dll library processes data blocks from WordPerfect files, it fails to properly validate the size or boundaries of incoming data, allowing attackers to craft specially formatted documents that trigger the overflow condition. This heap-based overflow specifically targets the memory layout of the application, potentially enabling attackers to overwrite function pointers, return addresses, or other critical control data structures. The vulnerability's classification aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of improper input validation leading to memory corruption.
From an operational perspective, this vulnerability poses significant risk to organizations relying on Autonomy KeyView for document processing and content management. Attackers can remotely execute code on systems that process WordPerfect documents through the vulnerable KeyView components, potentially gaining full system control or establishing persistent backdoors. The remote execution capability means that adversaries can exploit this vulnerability without requiring physical access to the target systems, making it particularly dangerous in networked environments. The impact extends beyond simple code execution to include potential privilege escalation, data exfiltration, and system compromise, especially when the vulnerable applications run with elevated privileges.
The mitigation strategies for CVE-2010-0135 should focus on immediate patching of affected Autonomy KeyView versions, as well as implementing network-based controls to restrict processing of untrusted WordPerfect documents. Organizations should consider deploying application whitelisting solutions to prevent execution of vulnerable components, while also implementing network segmentation to limit lateral movement if exploitation occurs. Security monitoring should include detection of suspicious file processing activities and anomalous memory allocation patterns that may indicate exploitation attempts. Additionally, the vulnerability demonstrates the importance of proper input validation and memory management practices, aligning with ATT&CK technique T1059.007 for command and script interpreter execution, as attackers may leverage this vulnerability to establish persistent access through malicious code injection. The remediation approach should also include comprehensive vulnerability assessment of all systems using legacy document processing libraries, as similar vulnerabilities may exist in other components that process similar file formats.