CVE-2025-55188 in 7-Zip
Summary
by MITRE • 08/09/2025
7-Zip before 25.01 does not always properly handle symbolic links during extraction.
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Analysis
by VulDB Data Team • 08/31/2025
CVE-2025-55188 represents a symbolic link handling vulnerability within 7-Zip software versions prior to 25.01, which falls under the broader category of improper input validation and path traversal issues. This vulnerability stems from the software's inadequate processing of symbolic links during archive extraction operations, creating potential security risks that can be exploited by malicious actors. The flaw manifests when 7-Zip encounters symbolic links within compressed archives and fails to properly resolve or validate these links before extracting them to the target system. This improper handling can lead to unexpected behavior where symbolic links may be created or modified in unintended locations, potentially allowing attackers to manipulate the file system structure or bypass access controls.
The technical nature of this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and CWE-310, which covers cryptographic issues including weak randomness. The operational impact of this flaw extends beyond simple file extraction, as it can enable attackers to create symbolic links that point to sensitive system locations or directories that should remain protected. When 7-Zip processes archives containing malicious symbolic links, the software may inadvertently create these links in locations where they can be exploited to gain unauthorized access or cause system instability. This vulnerability particularly affects environments where 7-Zip is used to extract archives from untrusted sources, as the software's failure to properly validate symbolic links during extraction creates opportunities for path traversal attacks.
From an attack perspective, this vulnerability can be leveraged through the ATT&CK technique T1059.001, which involves executing commands through the command and scripting interpreter, when attackers craft malicious archives that contain symbolic links designed to redirect file operations to sensitive locations. The impact of exploitation can range from information disclosure to privilege escalation, depending on the target system configuration and the specific symbolic links created during extraction. Organizations using 7-Zip for archive processing should be particularly concerned about this vulnerability when handling archives from external sources or when automated systems process compressed files without proper validation. The vulnerability demonstrates the importance of proper input sanitization and path validation in archive handling software, as the failure to properly process symbolic links can create persistent security weaknesses.
Mitigation strategies for CVE-2025-55188 should focus on immediate software updates to 7-Zip version 25.01 or later, which contains the necessary fixes to properly handle symbolic links during extraction. System administrators should implement additional controls such as validating archive contents before extraction, implementing restricted extraction environments, and monitoring for suspicious symbolic link creation. Organizations should also consider implementing automated scanning tools that can detect and prevent the extraction of archives containing potentially malicious symbolic links. The vulnerability underscores the critical need for proper path validation and input sanitization in archive processing utilities, as this flaw can be exploited to bypass security controls and create persistent access points within target systems. Regular security assessments should include verification of archive handling software configurations to ensure that symbolic link processing is properly restricted and validated.