ProFTPD through 1.3.9e and 1.3.10rc1 through 1.3.10rc4 contains a link-following vulnerability in mod_copy that allows authenticated FTP users to bypass Limit WRITE restrictions via symlinks. Attackers can place a symlink in a writable directory and use SITE COPY or SITE CPTO to overwrite files in write-denied locations.
Fix
Patch, vendor advisory and mitigation references on NVD 1
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.0 · proftpd projectNVD modified 2026-10-30 11:30
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 7
- https://github.com/proftpd/proftpd/issues/2374 issue-tracking
- https://github.com/proftpd/proftpd/commit/c41691f8981f98081fcb8a535c3c21b06a3f04af patch
- https://github.com/proftpd/proftpd/blob/v1.3.9e/contrib/mod_copy.c#L620 technical-description
- https://github.com/proftpd/proftpd/releases/tag/v1.3.10rc5 release-notes
- https://abraxaslabs.tech/research/proftpd-site-copy-dest-follow third-party-advisory
- https://github.com/proftpd/proftpd product
- https://www.vulncheck.com/advisories/proftpd-through-1.3-9e-and-1.3-10rc4-mod-copy-symlink-following-write-bypass third-party-advisory