CVE-2026-35025
published 2026-06-24CVE-2026-35025: ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL…
PriorityP354high8.1CVSS 3.1
AVNACLPRLUINSUCHIHAN
EPSS
0.34%
26.4th percentile
ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir_canonical_path() to cause dir_check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| proftpd_project | proftpd | <= 1.3.9b | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
nvdv4.08.6HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Bugzilla
CVE-2026-35025 proftpd: ACL bypass via /proc/self/root path prefix in RNFR [fedora-all]
bugzilla·2026-06-24·CVSS 8.1
CVE-2026-35025 [HIGH] CVE-2026-35025 proftpd: ACL bypass via /proc/self/root path prefix in RNFR [fedora-all]
CVE-2026-35025 proftpd: ACL bypass via /proc/self/root path prefix in RNFR [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
Note that the default configuration for ProFTPD in Fedora includes "DefaultRoot ~ !adm", which mitigates this issue for any user not called "adm".
Bugzilla
CVE-2026-35025 proftpd: ACL bypass via /proc/self/root path prefix in RNFR [epel-all]
bugzilla·2026-06-24·CVSS 8.1
CVE-2026-35025 [HIGH] CVE-2026-35025 proftpd: ACL bypass via /proc/self/root path prefix in RNFR [epel-all]
CVE-2026-35025 proftpd: ACL bypass via /proc/self/root path prefix in RNFR [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
Note that the default configuration for ProFTPD in EPEL includes "DefaultRoot ~ !adm", which mitigates this issue for any user not called "adm".
Bugzilla
CVE-2026-35025 ProFTPD: ACL bypass via /proc/self/root path prefix in RNFR
bugzilla·2026-06-24·CVSS 8.1
CVE-2026-35025 [HIGH] CVE-2026-35025 ProFTPD: ACL bypass via /proc/self/root path prefix in RNFR
CVE-2026-35025 ProFTPD: ACL bypass via /proc/self/root path prefix in RNFR
ProFTPD through 1.3.9b and 1.3.10rc2 contains an access control bypass vulnerability that allows authenticated FTP users to circumvent Directory ACL restrictions by prefixing paths with /proc/self/root in the RNFR command handler. Attackers can exploit the unresolved symlink components in dir_canonical_path() to cause dir_check() to perform lexical path comparisons that match no configured Directory block, enabling rename operations on files in DenyAll-protected directories and subsequent retrieval of those files. Mitigation: Sessions configured with DefaultRoot (chroot) are not affected, as chroot changes the directory to which /proc/self/root resolves.
2026-06-24
Published