CVE-2003-1440 in Spamprobe
Summary
by MITRE
SpamProbe 0.8a allows remote attackers to cause a denial of service (crash) via HTML e-mail with newline characters within an href tag, which is not properly handled by certain regular expressions.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 06/16/2018
The vulnerability identified as CVE-2003-1440 affects SpamProbe version 0.8a, a spam filtering application designed to protect email systems from unwanted messages. This particular weakness represents a classic input validation flaw that can be exploited to disrupt service availability. The vulnerability specifically manifests when SpamProbe processes HTML email messages containing malformed hyperlink tags with embedded newline characters. The system's failure to properly sanitize these inputs creates an opportunity for malicious actors to craft specially formatted emails that trigger unexpected behavior in the application's processing logic.
The technical root cause of this vulnerability lies in the application's insufficient handling of regular expressions used to parse HTML content. When SpamProbe encounters an href tag containing newline characters within its structure, the regular expression patterns fail to properly account for these control characters, leading to improper string parsing and subsequent application instability. This type of vulnerability falls under the broader category of improper input handling and can be classified as a weakness in input validation according to CWE standards. The flaw demonstrates a lack of proper sanitization mechanisms that should be implemented when processing untrusted data from email sources.
The operational impact of this vulnerability extends beyond simple application instability, as it can be leveraged to create a denial of service condition that affects the entire email filtering infrastructure. Remote attackers can exploit this weakness by simply sending carefully crafted HTML emails that contain the malformed href tags, causing SpamProbe to crash and potentially restart automatically or become unresponsive. This disruption can lead to significant downtime for email services, as legitimate emails may be delayed or blocked while the system recovers from the crash. The vulnerability is particularly concerning in enterprise environments where email filtering systems are critical components of network security infrastructure, as it can be exploited to disrupt business communications and potentially mask other attack vectors.
Mitigation strategies for this vulnerability should focus on implementing proper input sanitization and regular expression validation within the SpamProbe application. System administrators should prioritize updating to patched versions of SpamProbe that address this specific weakness, as the vulnerability was likely resolved through improved HTML parsing routines and enhanced regular expression handling. Additionally, implementing defensive measures such as email content filtering at multiple layers, including network-level protections and additional spam filtering rules, can help reduce the risk of exploitation. Organizations should also consider implementing monitoring solutions that can detect unusual application behavior patterns and automatically alert administrators to potential exploitation attempts. The remediation process should include thorough testing of updated configurations to ensure that legitimate email processing continues to function properly while the vulnerability is addressed. This vulnerability highlights the importance of proper input validation in security-critical applications and aligns with ATT&CK techniques focused on service disruption and denial of service attacks through application-level flaws.