The Netlink implementation in the Linux kernel before 3.2.30 does not properly handle messages that lack SCM_CREDENTIALS data, which might allow local users to spoof Netlink communication via a crafted message, as demonstrated by a message to (1) Avahi or (2) NetworkManager.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2016-0037 for details.

Updated kernel-rt packages that fix several security issues and multiple bugs are now available for Red Hat Enterprise MRG 2.2.

The Red Hat Security Response Team 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.

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

This update fixes the following security issues :

* A flaw was found in the way Netlink messages without SCM_CREDENTIALS (used for authentication) 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. (CVE-2012-3520, Important)

* 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. (CVE-2012-4508, Important)

* A use-after-free flaw was found in the Linux kernel's memory management subsystem in the way quota handling for huge pages was performed. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges.
(CVE-2012-2133, Moderate)

* A use-after-free flaw was found in the madvise() system call implementation in the Linux kernel. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2012-3511, Moderate)

* A divide-by-zero flaw was found in the TCP Illinois congestion control algorithm implementation in the Linux kernel. If the TCP Illinois congestion control algorithm were in use (the sysctl net.ipv4.tcp_congestion_control variable set to 'illinois'), a local, unprivileged user could trigger this flaw and cause a denial of service. (CVE-2012-4565, Moderate)

* An information leak flaw was found in the uname() system call implementation in the Linux kernel. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space by setting the UNAME26 personality and then calling the uname() system call.
(CVE-2012-0957, Low)

* Buffer overflow flaws were found in the udf_load_logicalvol() function in the Universal Disk Format (UDF) file system implementation in the Linux kernel. An attacker with physical access to a system could use these flaws to cause a denial of service or escalate their privileges. (CVE-2012-3400, Low)

* A flaw was found in the way the msg_namelen variable in the rds_recvmsg() function of the Linux kernel's Reliable Datagram Sockets (RDS) protocol implementation was initialized. A local, unprivileged user could use this flaw to leak kernel stack memory to user-space.
(CVE-2012-3430, Low)

Red Hat would like to thank Pablo Neira Ayuso for reporting CVE-2012-3520; Theodore Ts'o for reporting CVE-2012-4508; Shachar Raindel for reporting CVE-2012-2133; and Kees Cook for reporting CVE-2012-0957. Upstream acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The CVE-2012-4565 issue was discovered by Rodrigo Freire of Red Hat, and the CVE-2012-3430 issue was discovered by the Red Hat InfiniBand team.

This update also fixes multiple bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section.

Users should upgrade to these updated packages, which upgrade the kernel-rt kernel to version kernel-rt-3.2.33-rt50, and correct these issues. The system must be rebooted for this update to take effect.

This kernel update to 3.4.11 fixes various bugs and security issues.

The changes up to 3.4.11 contain both security and bugfixes and are not explicitly listed here.

Following security issues were fixed: CVE-2012-3520: Force passing credentials, otherwise local services could be fooled to assume requests coming from root.

CVE-2012-3412: Do not allow extreme TSO parameters in the sfc driver and tcp stack.

Following non-security bugs were fixed :

  - nbd: clear waiting_queue on shutdown (bnc#778630).

  - NFS: avoid warning from nfs_drop_nlink (bnc#780624).

  - net: do not disable sg for packets requiring no checksum     (bnc#774859).

  - sfc: Fix maximum number of TSO segments and minimum TX     queue size (bnc#774523 CVE-2012-3412).

  - net: Allow driver to limit number of GSO segments per     skb (bnc#774523 CVE-2012-3412).

  - drm/nouveau: fix booting with plymouth + dumb support     (bnc#771392).

  - memcg: warn on deeper hierarchies with use_hierarchy==0     (bnc#781134).

  - Linux 3.4.11.

  - Update config files.

  - Refresh patches.suse/scsi-error-test-unit-ready-timeout.

  - Btrfs: fix tree log remove space corner case     (bnc#779432)

  - irq_remap: disable IRQ remapping if any IOAPIC lacks an     IOMMU.

  - Linux 3.4.10.

  - Linux 3.4.9.

  - kABI: protect struct irq_desc.

  - Linux 3.4.8.

  - kABI: sdhci, remove inclusion.

  - reiserfs: fix deadlock with nfs racing on create/lookup     (bnc#762693).

  - Properly update Xen patches to 3.4.7.

  - Refresh other Xen patches (bnc#772831).

  - config: enable various ARM errata workarounds to improve     stability

  - Import kabi files for 12.2

  - rpm/config.sh: Build the KOTD against 12.2

  - ASoC: omap: Add missing modules aliases to get sound     working on omap devices.

  - Update config files to fix build

  - rt2800: add chipset revision RT5390R support     (bnc#772566).

  - reiserfs: fix deadlocks with quotas

  - ACPI, APEI: Fixup common access width firmware bug     (bnc#765230).

  - i2c/busses: Fix build error if     CONFIG_I2C_DESIGNWARE_PLATFORM=y and CONFIG_I2C_DESIGN.

  - Update ARM configs to match kernel 3.4.7

  - Update ARM omap2plus config to match kernel 3.4.7 and     add Smartreflex support (auto voltage)

  - ALSA: hda - Fix mute-LED GPIO initialization for IDT     codecs (bnc#772923).

  - ALSA: hda - Fix polarity of mute LED on HP Mini 210     (bnc#772923).

  - Linux 3.4.7.

  - Refresh patches.suse/dm-raid45-26-Nov-2009.patch.

  - Enable RTL8150 for omap2plus Generic USB Network device     that also works fine on ARM, so enable it

  - update RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER patch name

  - Drivers: hv: Cleanup the guest ID computation.

  - hyperv: Add a check for ring_size value.

  - hyperv: Add error handling to rndis_filter_device_add().

  - Drivers: hv: Change the hex constant to a decimal     constant.

  - hyperv: Add support for setting MAC from within guests.

  - net/hyperv: Use wait_event on outstanding sends during     device removal.

  - hv: add RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER.

  - Refresh patches.suse/SUSE-bootsplash. Fix wrong vfree()     (bnc#773406)

Pablo Neira Ayuso discovered a flaw in the credentials of netlink messages. An unprivileged local attacker could exploit this by getting a netlink based service, that relies on netlink credentials, to perform privileged actions.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Pablo Neira Ayuso discovered a flaw in the credentials of netlink messages. An unprivileged local attacker could exploit this by getting a netlink based service, that relies on netlink credentials, to perform privileged actions.

Fixes CVE-2012-3520, and a number of bugfixes from the 3.4.10 stable queue

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
90019	OracleVM 3.2 : kernel-uek (OVMSA-2016-0037)	Nessus	OracleVM Local Security Checks	critical
76653	RHEL 6 : MRG (RHSA-2012:1491)	Nessus	Red Hat Local Security Checks	high
74778	openSUSE Security Update : kernel (openSUSE-SU-2012:1330-1)	Nessus	SuSE Local Security Checks	high
69612	Amazon Linux AMI : kernel (ALAS-2012-122)	Nessus	Amazon Linux Local Security Checks	low
62547	Ubuntu 12.04 LTS : linux vulnerability (USN-1610-1)	Nessus	Ubuntu Local Security Checks	low
62475	USN-1599-1 : linux-ti-omap4 vulnerability	Nessus	Ubuntu Local Security Checks	low
61739	Fedora 16 : kernel-3.4.9-2.fc16 (2012-12684)	Nessus	Fedora Local Security Checks	low

Detections

Analytics

CVE-2012-3520

medium

Tenable Plugins

critical

high

high

low

low

low

low