File::Rotate::Simple versions before 0.4.0 for Perl create the target of dangling symlinks when rotating files. When the file to be rotated is a symbolic link to a missing file, and the touch option is enabled, then the rotate method assumes that the file is absent (since the existence check is against the target), and does not rotate it. But it touches the file, which creates the target.
An attacker that has the ability to create the symlink can use this to create an arbitrary file with permissions of the process rotating the files (which may be different from the process that normally writes to the log file that is being rotated). Note that the touch option is disabled by default.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
High
Difficult to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
rrwo:file::rotate::simple
References 4
https://github.com/robrwo/File-Rotate-Simple/commit/ead3f5c0e51217b34d286aa2439…
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://github.com/robrwo/File-Rotate-Simple/security/advisories/GHSA-fpmm-8f6h…
9b29abf9-4ab0-4765-b253-1875cd9b441e
https://metacpan.org/release/RRWO/File-Rotate-Simple-v0.4.0/changes
9b29abf9-4ab0-4765-b253-1875cd9b441e
http://www.openwall.com/lists/oss-security/2026/08/07/7
af854a3a-2127-422b-91ae-364da2661108