CVE-2004-1326 in Dxterm
Summary
by MITRE
Buffer overflow in dxterm in Ultrix 4.5 allows local users to execute arbitrary code via a long -setup parameter.
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Analysis
by VulDB Data Team • 07/03/2025
The vulnerability described in CVE-2004-1326 represents a classic buffer overflow flaw within the dxterm application running on Ultrix 4.5 operating systems. This issue specifically manifests when the application processes command-line arguments, particularly the -setup parameter which is used to configure display settings for the terminal application. The flaw stems from inadequate input validation and bounds checking within the dxterm codebase, allowing an attacker to provide an excessively long argument that exceeds the allocated buffer space. Such buffer overflow conditions fall under the CWE-121 category of stack-based buffer overflow, where the overflow occurs in stack memory allocated for local variables and function parameters. The vulnerability is classified as local privilege escalation since it requires an attacker to already have access to the system with user-level permissions to exploit the flaw.
The technical implementation of this vulnerability involves the dxterm application failing to properly validate the length of the -setup parameter before copying it into a fixed-size buffer. When a malicious user provides a sufficiently long argument string, the excess data overflows into adjacent memory locations, potentially overwriting critical program state information including return addresses on the stack. This memory corruption can be exploited to redirect program execution flow to arbitrary code locations within the application or adjacent memory regions. The attack vector is particularly concerning because it allows local users to gain elevated privileges, as the dxterm application likely runs with sufficient privileges to execute system-level operations. The vulnerability demonstrates poor defensive programming practices and highlights the importance of implementing robust input validation mechanisms that prevent buffer overflows from occurring in the first place.
The operational impact of this vulnerability extends beyond simple code execution, as it can potentially allow attackers to escalate privileges within the Ultrix 4.5 environment. Since the application is typically used for terminal emulation and display configuration, attackers could leverage this flaw to execute malicious code with the privileges of the user running dxterm, which may include administrative capabilities depending on the system configuration. This vulnerability aligns with the ATT&CK framework's privilege escalation tactics, specifically targeting the execution of malicious code through application flaws. The local nature of the exploit means that network-based attacks are not directly possible, but the vulnerability can be leveraged by any user with access to the system, making it particularly dangerous in multi-user environments where attackers might have legitimate access to the platform. System administrators should consider this vulnerability as part of their overall security posture, especially in legacy environments where Ultrix 4.5 systems may still be operational.
Mitigation strategies for CVE-2004-1326 should focus on immediate patching of the dxterm application or implementation of input validation controls. The most effective solution involves applying vendor-specific patches that correct the buffer overflow by implementing proper bounds checking on the -setup parameter. Organizations should also consider implementing additional security measures such as address space layout randomization and stack canaries to make exploitation more difficult even if similar vulnerabilities exist. Input sanitization should be enforced at the application level to ensure that all command-line parameters are validated against maximum length constraints before processing. System administrators should conduct thorough vulnerability assessments to identify other applications running on Ultrix 4.5 systems that may be susceptible to similar buffer overflow conditions. The remediation process should also include reviewing system access controls to limit user privileges where possible, reducing the potential impact of successful exploitation attempts. Security monitoring should be enhanced to detect anomalous command-line argument patterns that might indicate attempts to exploit this vulnerability.