CVE-2009-1586 in GrabIt
Summary
by MITRE
Stack-based buffer overflow in the NZB importer feature in GrabIt 1.7.2 Beta 3 and earlier allows remote attackers to execute arbitrary code via a crafted DTD reference in a DOCTYPE element in an NZB file.
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Analysis
by VulDB Data Team • 11/28/2024
The vulnerability identified as CVE-2009-1586 represents a critical stack-based buffer overflow flaw within the GrabIt software application's NZB importer functionality. This issue affects versions 1.7.2 Beta 3 and earlier, where the software fails to properly validate input data when processing NZB files that contain maliciously crafted DTD references within DOCTYPE elements. The flaw exists in the parsing mechanism that handles XML-based NZB file structures, specifically in how the application manages memory allocation for buffer storage during the processing of external entity references. The vulnerability stems from inadequate bounds checking and memory management practices within the XML parser component that processes these file formats.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious NZB file containing a specially constructed DOCTYPE declaration with an external DTD reference that triggers a buffer overflow condition. When the vulnerable GrabIt application processes this file, the malformed DTD reference causes the application to write data beyond the allocated buffer boundaries in the stack memory region. This memory corruption can overwrite critical program execution data including return addresses, function pointers, and other control structures necessary for proper program operation. The buffer overflow allows an attacker to potentially overwrite the instruction pointer and redirect execution flow to malicious code injected into the stack memory, enabling arbitrary code execution with the privileges of the affected application process.
The operational impact of this vulnerability is severe as it provides remote attackers with a pathway to compromise systems running vulnerable versions of GrabIt without requiring any local access or user interaction beyond the simple act of opening the malicious NZB file. Attackers can leverage this vulnerability to execute malicious payloads including malware installation, privilege escalation, or establishing persistent backdoors on compromised systems. The vulnerability affects any system where GrabIt is installed and configured to process NZB files from untrusted sources, making it particularly dangerous in environments where users frequently download and process content from public newsgroups or third-party NZB file repositories. The exploitability of this flaw is enhanced by the fact that NZB files are commonly shared through automated download systems and may be processed without user awareness.
Security mitigations for CVE-2009-1586 should prioritize immediate remediation through software updates to versions that address the buffer overflow condition in the NZB importer component. Organizations should implement strict input validation policies for all NZB file processing activities and consider deploying application whitelisting solutions to restrict execution of unauthorized software. Network-level defenses including firewall rules and intrusion detection systems can help prevent the download of suspicious NZB files from untrusted sources. The vulnerability aligns with CWE-121 stack-based buffer overflow classification and maps to attack techniques documented under the ATT&CK framework in the execution and privilege escalation domains. System administrators should also consider implementing sandboxing mechanisms for processing untrusted file formats and regularly monitoring for signs of exploitation attempts through log analysis and behavioral monitoring systems.