CVE-2005-2298 in BitDefender Engine
Summary
by MITRE
BitDefender Engine 1.6.1 and earlier does not properly scan all attachments, which allows remote attackers to bypass virus scanning via begin and end commands in the body of the e-mail, which BitDefender treats as a uuencoded attachment and stops scanning afterwards.
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Analysis
by VulDB Data Team • 07/26/2017
The vulnerability identified as CVE-2005-2298 resides within BitDefender Engine versions 1.6.1 and earlier, representing a critical flaw in email security scanning mechanisms. This weakness specifically affects the engine's ability to properly analyze all email attachments, creating a significant bypass opportunity for malicious actors. The vulnerability exploits the engine's parsing logic, where it incorrectly interprets certain command sequences within email bodies as uuencoded attachment markers, fundamentally altering the scanning behavior.
The technical flaw manifests when BitDefender encounters specific begin and end commands placed within the email body content. These commands are typically used in uuencoding processes to denote the start and end of encoded data sections. However, the BitDefender engine fails to distinguish between legitimate uuencoding markers in email content and maliciously crafted commands designed to disrupt the scanning process. When the engine detects these commands, it incorrectly assumes that a uuencoded attachment has been encountered and subsequently ceases further scanning of the email content, effectively allowing malicious payloads to bypass detection entirely.
This vulnerability creates substantial operational impact within enterprise security environments where BitDefender is deployed as a primary email scanning solution. Attackers can craft emails containing benign-looking content with embedded malicious commands that, when processed by the vulnerable engine, cause the security system to prematurely terminate scanning operations. The bypass mechanism operates at the application layer, specifically targeting the email content processing and analysis components of the security solution. This allows threat actors to deliver malware, phishing content, or other malicious payloads without triggering security alerts, undermining the fundamental purpose of email security scanning.
The vulnerability aligns with CWE-1238, which addresses improper handling of encoded data in security scanning systems, and demonstrates characteristics consistent with ATT&CK technique T1192, involving the use of encoded malicious content to bypass security controls. Organizations relying on affected BitDefender versions face increased risk of successful phishing campaigns, malware delivery, and other email-based attacks that would otherwise be detected by proper scanning protocols. The flaw represents a classic case of insufficient input validation and improper state management in security scanning applications.
Mitigation strategies for this vulnerability require immediate patching of BitDefender engines to versions that properly handle email content parsing and command sequence detection. Organizations should also implement additional email security measures including content filtering, sandboxing, and multi-layered scanning approaches that do not rely solely on the vulnerable engine's parsing logic. Network administrators should consider implementing email security gateways that perform independent content analysis and maintain detailed logging of email processing activities to detect potential exploitation attempts. Regular security assessments and vulnerability scanning of email security infrastructure should be conducted to identify similar weaknesses in other security solutions and maintain comprehensive protection against evolving threat vectors.