CVE-2008-0883 in Acrobat Reader
Summary
by MITRE
acroread in Adobe Acrobat Reader 8.1.2 allows local users to overwrite arbitrary files via a symlink attack on temporary files related to SSL certificate handling.
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Analysis
by VulDB Data Team • 06/30/2025
Adobe Acrobat Reader version 8.1.2 contains a critical file system vulnerability that enables local attackers to perform arbitrary file overwrite operations through a symbolic link attack targeting temporary files used during SSL certificate validation processes. This vulnerability stems from improper handling of temporary files created during certificate processing, where the application creates temporary files with predictable names and locations without adequate security checks. The flaw occurs when Acrobat Reader processes SSL certificates, creating temporary files that are subsequently accessed via symbolic links, allowing malicious users to manipulate the file system by pre-creating symbolic links that point to sensitive system files.
The technical implementation of this vulnerability aligns with CWE-367, which describes Time-of-Check to Time-of-Use (TOCTOU) race conditions that occur when the system checks file permissions or existence at one point in time but accesses the file at a later point when the file may have been changed by an attacker. In this case, the vulnerability manifests when Acrobat Reader checks for the existence of temporary files and then creates or modifies them without revalidating the file system state between these operations. Attackers can exploit this by creating symbolic links with the same names as the temporary files that Acrobat Reader expects to create, effectively redirecting the application's file operations to arbitrary locations on the system.
The operational impact of this vulnerability extends beyond simple file overwrites, as it provides attackers with potential access to system resources that could be leveraged for privilege escalation or persistent access. When combined with other attack vectors, this vulnerability could allow an attacker to replace critical system files, modify configuration data, or inject malicious code into the application environment. The attack requires local system access and can be executed by any user with the ability to create symbolic links, making it particularly dangerous in multi-user environments where users may have varying levels of system privileges. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059 for command and script interpreter and T1068 for exploit for privilege escalation.
Mitigation strategies for this vulnerability should focus on both immediate defensive measures and long-term remediation approaches. System administrators should ensure that Acrobat Reader is updated to versions that address this vulnerability, as Adobe released patches specifically targeting this issue in subsequent releases. Additionally, organizations should implement file system permissions that limit the ability of users to create symbolic links in critical application directories, and consider implementing mandatory access controls or application whitelisting solutions to restrict execution of vulnerable applications. The vulnerability also highlights the importance of proper temporary file handling in application design, emphasizing the need for atomic file creation operations that avoid race conditions between file checks and file operations. Organizations should conduct regular security assessments to identify similar vulnerabilities in other applications and ensure that all system components follow secure coding practices that prevent TOCTOU race conditions and other file system manipulation attacks.