CVE-2008-0392 in Visual Basic
Summary
by MITRE
Multiple buffer overflows in Microsoft Visual Basic Enterprise Edition 6.0 SP6 allow user-assisted remote attackers to execute arbitrary code via a .dsr file with a long (1) ConnectionName or (2) CommandName line.
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Analysis
by VulDB Data Team • 10/14/2024
Microsoft Visual Basic Enterprise Edition 6.0 SP6 contains multiple buffer overflow vulnerabilities that arise from insufficient input validation when processing .dsr files. These vulnerabilities specifically affect the ConnectionName and CommandName fields within the .dsr file format, where attacker-controlled input exceeding predetermined buffer limits can trigger memory corruption. The flaw exists in the parsing logic that handles database connection specifications, making it susceptible to exploitation when the software processes maliciously crafted .dsr files. This vulnerability falls under CWE-121, heap-based buffer overflow, and represents a classic example of improper input validation leading to arbitrary code execution. The attack requires user assistance, meaning a victim must open or process the malicious .dsr file for exploitation to occur, typically through social engineering or phishing techniques. The buffer overflow occurs in the software's database connectivity component, which is commonly used in enterprise applications for data access and manipulation.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to gain full control over the affected system running Visual Basic Enterprise Edition 6.0 SP6. Successful exploitation allows remote attackers to execute malicious code with the privileges of the victim user, potentially leading to complete system compromise. The vulnerability affects Windows operating systems where Visual Basic 6.0 SP6 is installed, particularly in enterprise environments where legacy applications may still be in use. Attackers can leverage this weakness to establish persistent access, escalate privileges, or deploy additional malware. The exploitation mechanism aligns with ATT&CK technique T1059.007 for command and scripting interpreter, and T1068 for exploit for privilege escalation, as the buffer overflow enables arbitrary code execution that can be used for further compromise. This vulnerability represents a significant risk in environments where legacy software remains operational and where proper patch management practices are not fully implemented.
Mitigation strategies for this vulnerability include immediate patching of Visual Basic Enterprise Edition 6.0 SP6 to the latest available security updates from Microsoft, though given the age of this software, support may have ended. Organizations should implement strict file validation policies, particularly for .dsr files and other database connection files, and disable automatic processing of untrusted files. Network segmentation and access controls should be enforced to limit exposure, while monitoring systems should be configured to detect suspicious file processing activities. Security awareness training for users can help prevent social engineering attacks that might deliver malicious .dsr files. Additionally, organizations should consider migrating away from legacy Visual Basic 6.0 applications to modern development environments that receive ongoing security support and have better memory safety features. The vulnerability demonstrates the importance of maintaining up-to-date software and proper input validation practices, as buffer overflows continue to be a prevalent class of security flaws in legacy systems. Organizations should also implement application whitelisting policies to prevent execution of untrusted code and maintain comprehensive system monitoring to detect potential exploitation attempts.