Description
The btrfs_xattr_set_acl function in fs/btrfs/acl.c in btrfs in the Linux kernel 2.6.34 and earlier does not check file ownership before setting an ACL, which allows local users to bypass file permissions by setting arbitrary ACLs, as demonstrated using setfacl.
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=2f26afba
- [linux-kernel] 20100518 [PATCH] btrfs: should add a permission check for setfacl mailing-list
- [oss-security] 20100614 Re: CVE request - kernel: btrfs: prevent users from setting ACLs on files they do not own mailing-list
- [oss-security] 20100611 CVE request - kernel: btrfs: prevent users from setting ACLs on files they do not own mailing-list