Permissions, Privileges, and Access Controls in Linux kernel - CVE-2014-5207

Vulnerability details

The vulnerability allows a local #AU# to execute arbitrary code.

fs/namespace.c in the Linux kernel through 3.16.1 does not properly restrict clearing MNT_NODEV, MNT_NOSUID, and MNT_NOEXEC and changing MNT_ATIME_MASK during a remount of a bind mount, which allows local users to gain privileges, interfere with backups and auditing on systems that had atime enabled, or cause a denial of service (excessive filesystem updating) on systems that had atime disabled via a "mount -o remount" command within a user namespace.

Affected software

How to mitigate CVE-2014-5207

Links to Public Exploits and PoC-codes

• Exploit #4059 - Linux Kernel < 3.16.1 - 'Remount FUSE' Privilege Escalation (August 11, 2020)

External References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9566d6742852c527bf5af38af5cbb878dad75705
• http://osvdb.org/show/osvdb/110055
• http://packetstormsecurity.com/files/128595/Linux-Kernel-3.16.1-FUSE-Privilege-Escalation.html
• http://seclists.org/oss-sec/2014/q3/352
• http://www.exploit-db.com/exploits/34923
• http://www.openwall.com/lists/oss-security/2014/08/13/4
• http://www.securityfocus.com/bid/69216
• http://www.ubuntu.com/usn/USN-2317-1
• http://www.ubuntu.com/usn/USN-2318-1
• https://bugzilla.redhat.com/show_bug.cgi?id=1129662
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95266
• https://github.com/torvalds/linux/commit/9566d6742852c527bf5af38af5cbb878dad75705

Related Security Bulletins

• Permissions, Privileges, and Access Controls in Linux kernel
• Amazon Linux AMI update for kernel
• Ubuntu update for linux
• Ubuntu update for linux-lts-trusty