CVE-2007-4849 Information

Description

JFFS2 as used on One Laptop Per Child (OLPC) build 542 and possibly other Linux systems when POSIX ACL support is enabled does not properly store permissions during (1) inode creation or (2) ACL setting which might allow local users to access restricted files or directories after a remount of a filesystem related to \legacy modes\ and an inconsistency between dentry permissions and inode permissions.

Reference

http://dev.laptop.org/ticket/2732 http://git.infradead.org/?p=mtd-2.6.git;a=commitdiff;h=9ed437c50d89eabae763dd422579f73fdebf288d http://lists.infradead.org/pipermail/linux-mtd-cvs/2007-August/005897.html http://secunia.com/advisories/26978 http://secunia.com/advisories/28170 http://secunia.com/advisories/28706 http://www.debian.org/security/2007/dsa-1378 http://www.securityfocus.com/bid/25838 http://www.ubuntu.com/usn/usn-558-1 http://www.ubuntu.com/usn/usn-574-1