CVE-2009-0363 in BarnOwl
Summary
by MITRE
Multiple buffer overflows in (a) BarnOwl before 1.0.5 and (b) owl 2.1.11 allow remote attackers to execute arbitrary code via vectors involving (1) a crafted zcrypt message, related to zcrypt.c; (2) a reply command on a message with a Zephyr Cc: list, related to zwrite.c; and unspecified other use of the products.
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Analysis
by VulDB Data Team • 10/28/2018
The vulnerability identified as CVE-2009-0363 represents a critical security flaw affecting BarnOwl versions prior to 1.0.5 and owl version 2.1.11, with multiple buffer overflow conditions that create significant remote code execution risks. These vulnerabilities stem from inadequate input validation and memory management practices within the zcrypt and zwrite components of these messaging applications. The flaw specifically manifests when processing crafted zcrypt messages through zcrypt.c and when handling reply commands on messages containing Zephyr Cc: lists through zwrite.c, creating exploitable conditions that could allow malicious actors to execute arbitrary code on affected systems.
The technical implementation of these buffer overflows occurs due to insufficient bounds checking on user-supplied data inputs. When BarnOwl or owl processes a crafted zcrypt message, the application fails to properly validate the length of incoming data before copying it into fixed-size buffers, leading to memory corruption that can be leveraged for code execution. Similarly, the zwrite.c component does not adequately handle the parsing of Zephyr Cc: lists in reply commands, resulting in buffer overflows that can be exploited through carefully constructed message headers. These vulnerabilities fall under CWE-121, which specifically addresses stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows, demonstrating the comprehensive nature of the memory corruption issues present in these applications.
The operational impact of CVE-2009-0363 extends beyond simple remote code execution, as successful exploitation could enable attackers to gain full control over affected systems running vulnerable versions of BarnOwl or owl. This threat landscape aligns with ATT&CK technique T1059, which describes the use of command and scripting interpreters for code execution, as attackers could leverage these vulnerabilities to establish persistent access and execute malicious payloads. The remote nature of these exploits means that attackers do not require physical access to target systems, making these vulnerabilities particularly dangerous in networked environments where these messaging applications are deployed. Organizations using these applications face significant risk of unauthorized access, data compromise, and potential lateral movement within their networks if these vulnerabilities remain unpatched.
Mitigation strategies for CVE-2009-0363 primarily focus on immediate patch deployment, as the most effective solution involves upgrading to BarnOwl version 1.0.5 or later and owl version 2.1.12 or newer, which contain the necessary memory safety improvements. System administrators should also implement network segmentation to limit exposure of affected applications, particularly in environments where these messaging tools are used for sensitive communications. Additionally, monitoring network traffic for suspicious zcrypt message patterns and unusual reply command behaviors can help detect potential exploitation attempts. The vulnerability demonstrates the importance of proper input validation and memory management practices, as outlined in industry standards such as the CERT Secure Coding Standards, which emphasize the need for bounds checking and secure buffer handling to prevent such memory corruption vulnerabilities from being exploited in real-world scenarios.