CVE-2002-1317 in Solaris
Summary
by MITRE
Buffer overflow in Dispatch() routine for XFS font server (fs.auto) on Solaris 2.5.1 through 9 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a certain XFS query.
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Analysis
by VulDB Data Team • 09/06/2025
The vulnerability identified as CVE-2002-1317 represents a critical buffer overflow flaw within the XFS font server implementation on Solaris operating systems ranging from version 2.5.1 through 9. This security weakness specifically resides in the Dispatch() routine of the fs.auto component, which serves as the core processing function for handling XFS queries. The XFS font server operates as part of the X Window System infrastructure, managing font resources and serving requests from X clients across network connections. The buffer overflow condition occurs when the server processes malformed or excessively long XFS queries without proper input validation or bounds checking, creating an exploitable memory corruption scenario that can be leveraged by remote attackers to compromise system integrity.
The technical exploitation of this vulnerability follows a well-established pattern where attackers craft malicious XFS queries that exceed the allocated buffer space within the Dispatch() function. This overflow can overwrite adjacent memory locations including return addresses and control data structures, potentially allowing remote code execution with the privileges of the XFS font server process. The vulnerability is particularly dangerous because it operates over network connections, enabling attackers to exploit the flaw from remote locations without requiring local system access. According to CWE classification, this represents a classic buffer overflow vulnerability categorized under CWE-121, which specifically addresses stack-based buffer overflow conditions that can lead to arbitrary code execution or system crashes. The attack vector aligns with ATT&CK technique T1203, which describes the exploitation of software vulnerabilities for privilege escalation and system compromise.
The operational impact of CVE-2002-1317 extends beyond simple denial of service scenarios, as the vulnerability can result in complete system compromise when successfully exploited. A successful attack can lead to unauthorized code execution, potentially allowing attackers to gain shell access to affected systems, escalate privileges, or establish persistent backdoors. The vulnerability affects a wide range of Solaris versions, making it particularly concerning for organizations maintaining legacy systems or those that have not fully migrated from older Solaris releases. The XFS font server typically runs with elevated privileges to manage system font resources, which means that exploitation could provide attackers with significant system access rights. Organizations with network-accessible X Window System implementations are particularly vulnerable, as the attack can be executed entirely over the network without requiring physical access or prior authentication.
Mitigation strategies for this vulnerability should include immediate patching of affected Solaris systems with the vendor-provided security updates, which typically address the buffer overflow by implementing proper input validation and bounds checking in the Dispatch() routine. System administrators should also consider implementing network segmentation to limit access to X Window System services, particularly disabling unnecessary XFS font server functionality when not required. Additional protective measures include configuring firewall rules to restrict X11 traffic to trusted networks only, implementing intrusion detection systems to monitor for suspicious XFS query patterns, and conducting regular security assessments to identify and remediate similar vulnerabilities in other system components. The vulnerability highlights the importance of proper input validation and memory management practices in server applications, emphasizing the need for defensive programming techniques that prevent buffer overflows and other memory corruption vulnerabilities that could be exploited by malicious actors.