CVE-2003-0855 in Pan
Summary
by MITRE
Pan 0.13.3 and earlier allows remote attackers to cause a denial of service (crash) via a news post with a long author email address.
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Analysis
by VulDB Data Team • 09/05/2019
The vulnerability identified as CVE-2003-0855 affects Pan 0.13.3 and earlier versions of the news client software, presenting a remote denial of service condition that can be triggered by crafting malicious news posts with excessively long author email addresses. This flaw represents a classic buffer overflow vulnerability that occurs when the software fails to properly validate input length during the processing of news articles. The vulnerability specifically impacts the handling of email address fields within news post metadata, where the application does not enforce reasonable limits on the length of author information, leading to memory corruption when attempting to store or process unusually long email addresses.
The technical implementation of this vulnerability stems from inadequate input validation and memory management practices within the Pan news client. When processing news posts containing author email addresses exceeding normal length parameters, the software allocates insufficient buffer space to accommodate the extended input data. This creates a condition where the application attempts to write beyond the allocated memory boundaries, resulting in a segmentation fault or crash that terminates the news client process. The vulnerability operates at the application layer and requires no authentication or special privileges to exploit, making it particularly dangerous as it can be triggered remotely by any user posting to a newsgroup that the vulnerable client processes. The flaw aligns with CWE-121, which describes stack-based buffer overflow conditions, and demonstrates poor input validation practices that are commonly exploited in denial of service attacks.
The operational impact of CVE-2003-0855 extends beyond simple service disruption, as it can be leveraged to create persistent availability issues for news client users and administrators. Attackers can systematically target news servers or newsgroups that use vulnerable Pan versions, causing repeated crashes and forcing users to restart their news clients repeatedly. This vulnerability particularly affects environments where news clients automatically fetch and display content from multiple sources, as a single malicious post can cause cascading failures across multiple client instances. The remote nature of the attack means that threat actors can exploit this vulnerability from anywhere on the internet without requiring physical access or network proximity to the affected systems. Organizations relying on Pan for news processing may experience significant downtime and user frustration, potentially leading to service degradation or complete loss of news functionality until the vulnerability is patched.
Mitigation strategies for CVE-2003-0855 primarily involve immediate software updates to versions that address the buffer overflow condition through proper input validation and memory management. System administrators should prioritize patching affected Pan installations and verify that updated versions properly enforce reasonable limits on email address length fields. Additional defensive measures include implementing network-level filtering to restrict the length of incoming news data, deploying intrusion detection systems that can identify suspicious news post patterns, and configuring news clients to reject posts with unusually long metadata fields. Organizations should also consider implementing network segmentation to limit the impact of potential exploitation and maintain regular vulnerability assessments to identify similar input validation flaws in other software components. The vulnerability demonstrates the critical importance of input validation and proper memory management practices, aligning with ATT&CK technique T1499.004 for network denial of service and highlighting the need for robust software security practices throughout the development lifecycle.