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Red Hat Security Advisory 2015-1082-01

Red Hat Security Advisory 2015-1082-01
Posted Jun 10, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1082-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A use-after-free flaw was found in the way the Linux kernel's SCTP implementation handled authentication key reference counting during INIT collisions. A remote attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system. It was found that the Linux kernel's implementation of vectored pipe read and write functionality did not take into account the I/O vectors that were already processed when retrying after a failed atomic access operation, potentially resulting in memory corruption due to an I/O vector array overrun. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system.

tags | advisory, remote, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2015-1421, CVE-2015-1805
SHA-256 | af5cb2c99c85406ffa55120a23f7ba62c025c773180ed68775f1b12da56a1861

Red Hat Security Advisory 2015-1082-01

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=====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security update
Advisory ID: RHSA-2015:1082-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1082.html
Issue date: 2015-06-09
CVE Names: CVE-2015-1421 CVE-2015-1805
=====================================================================

1. Summary:

Updated kernel packages that fix two security issues are now available for
Red Hat Enterprise Linux 6.2 Advanced Update Support.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AUS (v. 6.2 server) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.2) - x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

* A use-after-free flaw was found in the way the Linux kernel's SCTP
implementation handled authentication key reference counting during INIT
collisions. A remote attacker could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2015-1421,
Important)

* It was found that the Linux kernel's implementation of vectored pipe read
and write functionality did not take into account the I/O vectors that were
already processed when retrying after a failed atomic access operation,
potentially resulting in memory corruption due to an I/O vector array
overrun. A local, unprivileged user could use this flaw to crash the system
or, potentially, escalate their privileges on the system. (CVE-2015-1805,
Important)

The CVE-2015-1421 issue was discovered by Sun Baoliang of Red Hat, and the
security impact of the CVE-2015-1805 issue was discovered by Red Hat.

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1196581 - CVE-2015-1421 kernel: net: slab corruption from use after free on INIT collisions
1202855 - CVE-2015-1805 kernel: pipe: iovec overrun leading to memory corruption

6. Package List:

Red Hat Enterprise Linux AUS (v. 6.2 server):

Source:
kernel-2.6.32-220.63.2.el6.src.rpm

noarch:
kernel-doc-2.6.32-220.63.2.el6.noarch.rpm
kernel-firmware-2.6.32-220.63.2.el6.noarch.rpm

x86_64:
kernel-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debug-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debug-devel-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.63.2.el6.x86_64.rpm
kernel-devel-2.6.32-220.63.2.el6.x86_64.rpm
kernel-headers-2.6.32-220.63.2.el6.x86_64.rpm
perf-2.6.32-220.63.2.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.2):

Source:
kernel-2.6.32-220.63.2.el6.src.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-220.63.2.el6.x86_64.rpm
perf-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm
python-perf-2.6.32-220.63.2.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-220.63.2.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-1421
https://access.redhat.com/security/cve/CVE-2015-1805
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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