Описание
acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.
Пакеты
| Пакет | Статус | Версия исправления | Релиз | Тип |
|---|---|---|---|---|
| acl | fixed | 2.4.0-1 | package | |
| acl | no-dsa | trixie | package | |
| acl | postponed | bookworm | package | |
| acl | postponed | bullseye | package |
Примечания
https://www.openwall.com/lists/oss-security/2026/06/29/1
Fixed by: https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=601cc884a548ae9e9d246ae749e54b3272e4b1d7 (v2.4.0)
Fixed by: https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=54e14e9bc545f505b379d0792a2748d9baf88700 (v2.4.0)
Fixed by: https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=2c03ceefa0610d551d9cc089ce0a404cbe2d34b4 (v2.4.0)
Fixed by: https://cgit.git.savannah.nongnu.org/cgit/acl.git/commit/?id=2ee940139e9bba5005a3d987a6daecdda909089e (v2.4.0)
The fixes are based on a complete rewrite of the walk_tree helper.
EPSS
Связанные уязвимости
acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.
acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.
acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.
acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.
EPSS