CVE-1999-1036 in COPS
Summary
by MITRE
COPS 1.04 allows local users to overwrite or create arbitrary files via a symlink attack on temporary files in (1) res_diff, (2) ca.src, and (3) mail.chk.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability described in CVE-1999-1036 represents a classic symlink attack scenario affecting COPS 1.04 software, specifically targeting temporary file handling mechanisms during system operations. This issue manifests through three distinct executable components: res_diff, ca.src, and mail.chk, each of which creates temporary files without proper security checks that could be exploited by local attackers. The fundamental flaw lies in the improper handling of temporary file creation processes where the software does not validate or secure the temporary file paths before writing data to them, creating opportunities for privilege escalation and arbitrary file manipulation.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-353, which addresses the weakness of inadequate file permissions and improper temporary file handling. Attackers can create symbolic links in the directories where these temporary files are expected to be created, effectively redirecting the write operations from intended locations to arbitrary file paths chosen by the attacker. This symlink attack vector allows local users to overwrite existing files with malicious content or create new files with elevated privileges, potentially leading to system compromise. The attack requires local access but can result in significant security implications including privilege escalation and potential denial of service conditions.
The operational impact of CVE-1999-1036 extends beyond simple file manipulation as it can be leveraged to compromise system integrity and availability. When attackers successfully exploit this vulnerability through symlink attacks on temporary files, they may gain the ability to modify critical system files, inject malicious code into legitimate processes, or manipulate system configurations through the targeted temporary file operations. This type of vulnerability particularly affects systems where the COPS software runs with elevated privileges, as the temporary file creation process may inherit those privileges, amplifying the potential damage from the attack. The vulnerability also aligns with ATT&CK technique T1059, which covers the use of system utilities and commands for privilege escalation.
Mitigation strategies for this vulnerability focus on addressing the root cause through proper temporary file handling practices and implementing security controls that prevent symlink attacks. Organizations should ensure that all temporary file creation operations use secure methods such as creating files with unique names in secure directories with proper permissions, and avoiding predictable temporary file locations. The solution involves implementing proper file path validation and using atomic file creation techniques that prevent race conditions and symlink attacks. System administrators should also consider implementing file system permissions and access controls that limit write access to temporary directories, and regularly audit system configurations to identify and remediate similar vulnerabilities in other software components. Additionally, upgrading to patched versions of COPS 1.04 or implementing proper input validation and secure temporary file handling mechanisms can effectively prevent exploitation of this vulnerability.