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CVE-2012-0055

Status Candidate

Overview

OverlayFS in the Linux kernel before 3.0.0-16.28, as used in Ubuntu 10.0.4 LTS and 11.10, is missing inode security checks which could allow attackers to bypass security restrictions and perform unauthorized actions.

Related Files

Ubuntu Security Notice USN-1384-1
Posted Mar 6, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1384-1 - A bug was discovered in the Linux kernel's calculation of OOM (Out of memory) scores, that would result in the wrong process being killed. A user could use this to kill the process with the highest OOM score, even if that process belongs to another user or the system. Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-4097, CVE-2011-4127, CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207, CVE-2011-4097, CVE-2011-4127, CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207
SHA-256 | ba35da89b5eae8117d31f718c99da404c1ff80d437df5bc034c13a24bb0b4c94
Ubuntu Security Notice USN-1364-1
Posted Feb 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1364-1 - A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. Andy Whitcroft discovered a that the Overlayfs filesystem was not doing the extended permission checks needed by cgroups and Linux Security Modules (LSMs). A local user could exploit this to by-pass security policy and access files that should not be accessible. Various other issues were also addressed.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2012-0038, CVE-2012-0055, CVE-2012-0056, CVE-2012-0207, CVE-2012-0038, CVE-2012-0055, CVE-2012-0056, CVE-2012-0207
SHA-256 | e847291e2956e9eeb864470a8ac967e656c915178d520472524b2f9834c84e45
Ubuntu Security Notice USN-1363-1
Posted Feb 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1363-1 - A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. Andy Whitcroft discovered a that the Overlayfs filesystem was not doing the extended permission checks needed by cgroups and Linux Security Modules (LSMs). A local user could exploit this to by-pass security policy and access files that should not be accessible. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207, CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207
SHA-256 | 00db81ad81883140a2fb9f8a3cf95426da7934bf25c0269359abe6ac6c16194c
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