Horizon Alert
Summary of the vulnerability and why it matters
RARLAB UnRAR software on Linux and UNIX systems is susceptible to a directory traversal flaw. This vulnerability allows unauthorized access to write to files during an extraction process. The potential business impact includes unauthorized modification or creation of sensitive files.
- Vulnerable: RARLAB UnRAR on Linux/UNIX
- Flaw: Directory traversal during extraction
- Impact: Unauthorized file writing
Attack Path
How an attacker could exploit the issue
An attacker can exploit a directory traversal vulnerability in RARLAB UnRAR for Linux and UNIX. This vulnerability allows an attacker to write files to arbitrary locations on a system by manipulating the archive extraction process. The successful exploitation of this vulnerability could enable an attacker to gain unauthorized access or modify critical system files.
- Archive extraction without proper validation.
- Attacker provides a specially crafted archive.
- Arbitrary file write and system control.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows an attacker to write to arbitrary files on a system by exploiting a directory traversal flaw during the extraction of RAR archives. Exploitation could lead to unauthorized data modification or the compromise of system security, such as by creating a malicious SSH authorized keys file. The broad impact and the possibility of remote exploitation suggest that organizations should prioritize addressing this vulnerability.
- Attackers with low skill.
- No access or conditions needed.
- High business risk or urgency.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability allows unauthorized file creation on Linux and UNIX systems when processing RAR archives. Attackers can exploit this to gain elevated access by creating sensitive files, such as SSH authorized keys. This poses a significant risk to organizational systems and data integrity.
- Find systems using UnRAR.
- Restrict UnRAR access.
- Update UnRAR and confirm.
