Rsyslog: Remote file manipulation vulnerability
A vulnerability in rsyslog allows a remote, unauthenticated attacker to manipulate files on the host system, for which no patch is currently available.
Triage facts
Revision 1- Applicability
- rsyslog
- Evidence
- Unknown
- Severity
- High
- Action
- Elevated
- Sources
- 1 public source
- Freshness
- Revision 1Oct 23, 15:04 UTC
- Source quality
- A1Roughly even chance
A vulnerability has been identified in rsyslog that allows a remote, unauthenticated attacker to perform unauthorized file manipulation on the target host. No patch is currently available for this vulnerability. Security teams should monitor for updates from the maintainers and consider restricting network access to rsyslog services as a temporary mitigation.
Impact
Successful exploitation allows a remote attacker to manipulate files on the system running the vulnerable rsyslog service.
Recommendation
- Monitor official rsyslog security advisories for the release of a patch and apply it immediately upon availability.
- Restrict network access to rsyslog services to trusted internal sources to prevent unauthenticated remote exploitation.
- Monitor system logs and filesystem integrity for unauthorized modifications to sensitive configuration or system files, particularly those handled by the rsyslog service.
Immediate actions
Restrict network access to the rsyslog service to known, authorized hosts.
Threat Hunt
Monitor filesystem for unauthorized file creations or modifications by the rsyslog process or user account.
Data: Linux auditd file access logs, File integrity monitoring (FIM) events
Mitigations
Apply security patches for rsyslog immediately upon vendor release.
rsyslog file manipulation vulnerability
Gaps
- Lack of known exploit method or PoC limits signature-based detection