CVE-2008-1648 in Sympa
Summary
by MITRE
Sympa before 5.4 allows remote attackers to cause a denial of service (daemon crash) via an e-mail message with a malformed value of the Content-Type header and unspecified other headers. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 08/08/2019
The vulnerability identified as CVE-2008-1648 affects Sympa mailing list management software versions prior to 5.4, representing a significant security flaw that enables remote attackers to execute denial of service attacks against the system. This vulnerability specifically targets the daemon process that handles incoming email messages, making it particularly dangerous for organizations that rely on automated mailing list management services. The attack vector involves sending specially crafted email messages that contain malformed Content-Type header values along with other unspecified header manipulations, which ultimately leads to the daemon crashing and ceasing operations.
The technical mechanism behind this vulnerability resides in the insufficient input validation and error handling within Sympa's email processing routines. When the daemon receives an email message with malformed Content-Type headers, it fails to properly sanitize or reject the malformed input before attempting to process it. This processing failure results in an unhandled exception or memory corruption that causes the daemon to terminate abruptly. The unspecified nature of other affected headers suggests that the vulnerability may be part of a broader class of parsing weaknesses in the email handling subsystem, potentially affecting multiple header fields beyond just Content-Type. This type of vulnerability falls under CWE-129, which represents improper validation of the length or size of input data, and may also relate to CWE-20, representing improper input validation, as the system fails to adequately validate the structure and content of incoming email headers before processing them.
The operational impact of this vulnerability extends beyond simple service disruption, as it can be exploited by malicious actors to systematically target mailing list servers and render them unavailable to legitimate users. Organizations that depend on Sympa for managing newsletters, discussion groups, or automated communications may experience significant downtime, potentially affecting business operations and user productivity. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the internet without requiring physical access or authentication credentials, making it particularly dangerous for publicly accessible mailing list servers. The vulnerability creates a persistent threat that can be repeatedly exploited until the affected systems are patched, potentially leading to extended periods of service unavailability that could damage organizational reputation and user trust.
Mitigation strategies for this vulnerability should include immediate deployment of the patched Sympa version 5.4 or later, which contains proper input validation and error handling mechanisms to prevent the daemon from crashing when encountering malformed headers. System administrators should also implement additional protective measures such as email filtering rules that can detect and block suspicious header patterns, rate limiting to prevent abuse of the service, and monitoring systems that can quickly identify when daemon processes are crashing or restarting. Network-level protections including firewalls and intrusion detection systems can help identify and block malicious email traffic attempting to exploit this vulnerability. The remediation process should also include comprehensive testing to ensure that the patch does not introduce compatibility issues with existing mailing list configurations or legitimate email processing workflows. Organizations should also consider implementing email hygiene practices such as sender authentication mechanisms and content filtering to reduce the likelihood of receiving maliciously crafted emails that could exploit this or similar vulnerabilities. This vulnerability demonstrates the critical importance of maintaining up-to-date software and implementing robust input validation practices as recommended by the ATT&CK framework's defense evasion techniques, particularly those related to process injection and service disruption methods that attackers can leverage to compromise system availability.