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CVE-2014-5206

Status Candidate

Overview

The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox protection mechanisms via a "mount -o remount" command within a user namespace.

Related Files

Mandriva Linux Security Advisory 2014-201
Posted Oct 21, 2014
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2014-201 - Multiple vulnerabilities has been found and corrected in the Linux kernel. These include stack-based buffer overflows and denial of service issues.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, mandriva
advisories | CVE-2014-3122, CVE-2014-3181, CVE-2014-3182, CVE-2014-3184, CVE-2014-3185, CVE-2014-3186, CVE-2014-3534, CVE-2014-3601, CVE-2014-5077, CVE-2014-5206, CVE-2014-5471, CVE-2014-5472, CVE-2014-6410, CVE-2014-7975
SHA-256 | 18d0010448f4aacc19c217e3371db5d34c01d05bb3fb2bb9179b1b838891d685
Ubuntu Security Notice USN-2317-1
Posted Aug 18, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2317-1 - Eric W. Biederman discovered a flaw with the mediation of mount flags in the Linux kernel's user namespace subsystem. An unprivileged user could exploit this flaw to by-pass mount restrictions, and potentially gain administrative privileges. Kenton Varda discovered a flaw with read-only bind mounds when used with user namespaces. An unprivileged local user could exploit this flaw to gain full write privileges to a mount that should be read only. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-5206, CVE-2014-5207
SHA-256 | 891094f08750c7ff1ccc2f3aa4fe734c4fae78b401f90a2713af74ba81869398
Ubuntu Security Notice USN-2318-1
Posted Aug 18, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2318-1 - Eric W. Biederman discovered a flaw with the mediation of mount flags in the Linux kernel's user namespace subsystem. An unprivileged user could exploit this flaw to by-pass mount restrictions, and potentially gain administrative privileges. Kenton Varda discovered a flaw with read-only bind mounds when used with user namespaces. An unprivileged local user could exploit this flaw to gain full write privileges to a mount that should be read only. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-5206, CVE-2014-5207
SHA-256 | ac47389034e16265b91f850754f4d17ed121b6517b8fb5a79f805b8139d46dff
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