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CVE-2012-4508

Status Candidate

Overview

Race condition in fs/ext4/extents.c in the Linux kernel before 3.4.16 allows local users to obtain sensitive information from a deleted file by reading an extent that was not properly marked as uninitialized.

Related Files

Red Hat Security Advisory 2013-1783-01
Posted Dec 6, 2013
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2013-1783-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. An information leak flaw was found in the way the Linux kernel's device mapper subsystem, under certain conditions, interpreted data written to snapshot block devices. An attacker could use this flaw to read data from disk blocks in free space, which are normally inaccessible.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2012-4508, CVE-2013-2851, CVE-2013-4299
MD5 | b77c4c8ac04f0da3c37f0cdf435ac04a
Red Hat Security Advisory 2013-1519-01
Posted Nov 13, 2013
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2013-1519-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. An information leak flaw was found in the way Linux kernel's device mapper subsystem, under certain conditions, interpreted data written to snapshot block devices. An attacker could use this flaw to read data from disk blocks in free space, which are normally inaccessible.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2012-4508, CVE-2013-4299
MD5 | 47ff7c84810048cb180ee2ff0df2a546
Ubuntu Security Notice USN-1900-1
Posted Jul 5, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1900-1 - Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. An information leak was discovered in the Linux kernel's tkill and tgkill system calls when used from compat processes. A local user could exploit this flaw to examine potentially sensitive kernel memory. A format string vulnerability was discovered in Broadcom B43 wireless driver for the Linux kernel. A local user could exploit this flaw to gain administrative privileges. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-4508, CVE-2013-2141, CVE-2013-2852, CVE-2012-4508, CVE-2013-2141, CVE-2013-2852
MD5 | 4248cdb5374d0b8f58403ee24c28487d
Ubuntu Security Notice USN-1899-1
Posted Jul 5, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1899-1 - Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. An information leak was discovered in the Linux kernel's tkill and tgkill system calls when used from compat processes. A local user could exploit this flaw to examine potentially sensitive kernel memory. A format string vulnerability was discovered in Broadcom B43 wireless driver for the Linux kernel. A local user could exploit this flaw to gain administrative privileges. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-4508, CVE-2013-2141, CVE-2013-2852, CVE-2012-4508, CVE-2013-2141, CVE-2013-2852
MD5 | 0dc268d390c5d5febe9f6a8aff3807bc
Debian Security Advisory 2668-1
Posted May 15, 2013
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2668-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, information leak or privilege escalation.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2012-2121, CVE-2012-3552, CVE-2012-4461, CVE-2012-4508, CVE-2012-6537, CVE-2012-6539, CVE-2012-6540, CVE-2012-6542, CVE-2012-6544, CVE-2012-6545, CVE-2012-6546, CVE-2012-6548, CVE-2012-6549, CVE-2013-0349, CVE-2013-0914, CVE-2013-1767, CVE-2013-1773, CVE-2013-1774, CVE-2013-1792, CVE-2013-1796, CVE-2013-1798, CVE-2013-1826, CVE-2013-1860, CVE-2013-1928, CVE-2013-1929, CVE-2013-2015, CVE-2013-2634, CVE-2013-3222
MD5 | 69ed02210da6379f74ba3e864f1a5078
Red Hat Security Advisory 2013-0496-02
Posted Feb 21, 2013
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2013-0496-02 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2012-4508, CVE-2012-4542, CVE-2013-0190, CVE-2013-0309, CVE-2013-0310, CVE-2013-0311
MD5 | cc5d130c2338e49ff57490f9355f5513
Ubuntu Security Notice USN-1726-1
Posted Feb 15, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1726-1 - It was discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating the origin on Netlink messages. An untrusted local user can cause a denial of service of Linux guests in Hyper-V virtualization environments. Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-2669, CVE-2012-4508, CVE-2012-5532, CVE-2012-2669, CVE-2012-4508, CVE-2012-5532
MD5 | f376260e670f948ca72f47dab08382d6
Ubuntu Security Notice USN-1720-1
Posted Feb 13, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1720-1 - It was discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating the origin on Netlink messages. An untrusted local user can cause a denial of service of Linux guests in Hyper-V virtualization environments. Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-2669, CVE-2012-4508, CVE-2012-5532, CVE-2013-0190, CVE-2012-2669, CVE-2012-4508, CVE-2012-5532, CVE-2013-0190
MD5 | f823ccbe4a91f24404f779341d0559c7
Ubuntu Security Notice USN-1719-1
Posted Feb 12, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1719-1 - It was discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating the origin on Netlink messages. An untrusted local user can cause a denial of service of Linux guests in Hyper-V virtualization environments. Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-2669, CVE-2012-4508, CVE-2013-0190, CVE-2012-2669, CVE-2012-4508, CVE-2013-0190
MD5 | 767f2ec009b4bdff5be84b464105ee37
Ubuntu Security Notice USN-1704-2
Posted Feb 2, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1704-2 - USN-1704-1 fixed vulnerabilities in the Linux kernel. Due to an unrelated regression inotify/fanotify stopped working after upgrading. This update fixes the problem. Brad Spengler discovered a flaw in the Linux kernel's uname system call. An unprivileged user could exploit this flaw to read kernel stack memory. Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual machine) subsystem's handling of the XSAVE feature. On hosts, using qemu userspace, without the XSAVE feature an unprivileged local attacker could exploit this flaw to crash the system. Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. A flaw was discovered in the Linux kernel's handling of script execution when module loading is enabled. A local attacker could exploit this flaw to cause a leak of kernel stack contents. Rodrigo Freire discovered a flaw in the Linux kernel's TCP illinois congestion control algorithm. A local attacker could use this to cause a denial of service. A flaw was discovered in the Linux kernel's handling of new hot-plugged memory. An unprivileged local user could exploit this flaw to cause a denial of service by crashing the system. Florian Weimer discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating source addresses of netlink packets. An untrusted local user can cause a denial of service by causing hypervkvpd to exit. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, tcp, vulnerability
systems | linux, ubuntu
advisories | CVE-2012-0957, CVE-2012-4461, CVE-2012-4508, CVE-2012-4530, CVE-2012-4565, CVE-2012-5517, CVE-2012-5532
MD5 | ec938d9f9edb9255dc8518932ade6a5a
Ubuntu Security Notice USN-1704-1
Posted Jan 23, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1704-1 - Brad Spengler discovered a flaw in the Linux kernel's uname system call. An unprivileged user could exploit this flaw to read kernel stack memory. Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual machine) subsystem's handling of the XSAVE feature. On hosts, using qemu userspace, without the XSAVE feature an unprivileged local attacker could exploit this flaw to crash the system. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2012-0957, CVE-2012-4461, CVE-2012-4508, CVE-2012-4530, CVE-2012-4565, CVE-2012-5517, CVE-2012-5532, CVE-2012-0957, CVE-2012-4461, CVE-2012-4508, CVE-2012-4530, CVE-2012-4565, CVE-2012-5517, CVE-2012-5532
MD5 | ad1dbf8308a60ea5598f6aae1851f7cd
Red Hat Security Advisory 2012-1540-01
Posted Dec 4, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-1540-01 - These packages contain the Linux kernel. A race condition in the way asynchronous I/O and fallocate() interacted when using ext4 could allow a local, unprivileged user to obtain random data from a deleted file. A flaw in the way the Xen hypervisor implementation range checked guest provided addresses in the XENMEM_exchange hypercall could allow a malicious, para-virtualized guest administrator to crash the hypervisor or, potentially, escalate their privileges, allowing them to execute arbitrary code at the hypervisor level.

tags | advisory, arbitrary, kernel, local
systems | linux, redhat
advisories | CVE-2012-2372, CVE-2012-3552, CVE-2012-4508, CVE-2012-4535, CVE-2012-4537, CVE-2012-5513
MD5 | b91458cfe9a71a259fc48800519ec6ce
Red Hat Security Advisory 2012-1491-01
Posted Dec 4, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-1491-01 - The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. A flaw was found in the way Netlink messages without SCM_CREDENTIALS data set were handled. When not explicitly set, the data was sent but with all values set to 0, including the process ID and user ID, causing the Netlink message to appear as if it were sent with root privileges. A local, unprivileged user could use this flaw to send spoofed Netlink messages to an application, possibly resulting in the application performing privileged operations if it relied on SCM_CREDENTIALS data for the authentication of Netlink messages.

tags | advisory, kernel, local, root, spoof
systems | linux, redhat
advisories | CVE-2012-0957, CVE-2012-2133, CVE-2012-3400, CVE-2012-3430, CVE-2012-3511, CVE-2012-3520, CVE-2012-4508, CVE-2012-4565
MD5 | aece63615129fd789a2fd3c42520e29c
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