CVE-2010-0793 in BarnOwl
Summary
by MITRE
Buffer overflow in BarnOwl before 1.5.1 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted CC: header.
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Analysis
by VulDB Data Team • 05/02/2026
The vulnerability identified as CVE-2010-0793 represents a critical buffer overflow flaw within the BarnOwl messaging client software prior to version 1.5.1. This issue arises from inadequate input validation mechanisms within the application's handling of email headers, specifically targeting the CC: header field. The buffer overflow vulnerability stems from the application's failure to properly bounds-check data when processing incoming email messages, creating an exploitable condition that can be triggered by maliciously crafted email content. The vulnerability affects the core message processing functionality of BarnOwl, which is designed to handle various email protocols and formats, making it a significant security concern for users relying on this messaging client for communication.
The technical implementation of this vulnerability involves the application's memory management system where insufficient bounds checking allows an attacker to write data beyond the allocated buffer space reserved for processing the CC: header field. When a remote attacker crafts an email message containing an overly long CC: header value, the application's parsing routine fails to validate the input length against the buffer size, resulting in memory corruption. This memory corruption manifests as a stack-based buffer overflow that can overwrite adjacent memory locations including return addresses and control data, potentially leading to application crash or arbitrary code execution. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which is a well-documented weakness in software systems where insufficient bounds checking allows attackers to overwrite memory locations beyond the intended buffer boundaries.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable remote code execution capabilities. When exploited successfully, the buffer overflow can allow attackers to inject and execute malicious code within the context of the BarnOwl process, potentially compromising the entire system where the application is running. This vulnerability is particularly concerning in environments where BarnOwl is used for sensitive communications, as it could provide attackers with persistent access to network resources and communication channels. The attack vector requires only that a victim receive an email message containing the crafted CC: header, making it a highly accessible exploit that could affect numerous users without requiring specialized knowledge or access to privileged systems. The vulnerability demonstrates the critical importance of input validation and memory safety practices in messaging applications, as these systems often process untrusted data from external sources.
Mitigation strategies for CVE-2010-0793 primarily focus on upgrading to BarnOwl version 1.5.1 or later, which includes proper bounds checking and input validation mechanisms for email header processing. System administrators should implement immediate patch management procedures to ensure all affected systems receive the security update. Additional defensive measures include implementing email filtering rules that can detect and block malformed CC: headers, deploying network-based intrusion detection systems that monitor for suspicious email traffic patterns, and establishing secure email handling policies that limit exposure to untrusted sources. The vulnerability also highlights the importance of following secure coding practices such as those recommended by the CERT/CC Secure Coding Standards, which emphasize the need for proper bounds checking, input validation, and memory management in software development processes. Organizations should consider implementing application whitelisting controls and sandboxing techniques to limit the potential impact of similar vulnerabilities in other applications. The incident underscores the necessity of regular security assessments and vulnerability scanning to identify and remediate similar buffer overflow conditions across the entire software ecosystem.