Buffer overflow in the __nfs4_get_acl_uncached function in fs/nfs/nfs4proc.c in the Linux kernel before 3.7.2 allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a getxattr system call for the system.nfs4_acl extended attribute of a pathname on an NFSv4 filesystem.

Updated kernel packages that fix multiple security issues, address several hundred bugs, and add numerous enhancements are now available as part of the ongoing support and maintenance of Red Hat Enterprise Linux version 6. This is the fifth regular update.

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 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 the Linux kernel's IPv6 implementation handled certain UDP packets when the UDP Fragmentation Offload (UFO) feature was enabled. A remote attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system.
(CVE-2013-4387, Important)

* A flaw was found in the way the Linux kernel handled the creation of temporary IPv6 addresses. If the IPv6 privacy extension was enabled (/proc/sys/net/ipv6/conf/eth0/use_tempaddr set to '2'), an attacker on the local network could disable IPv6 temporary address generation, leading to a potential information disclosure. (CVE-2013-0343, Moderate)

* A flaw was found in the way the Linux kernel handled HID (Human Interface Device) reports with an out-of-bounds Report ID. An attacker with physical access to the system could use this flaw to crash the system or, potentially, escalate their privileges on the system.
(CVE-2013-2888, Moderate)

* An off-by-one flaw was found in the way the ANSI CPRNG implementation in the Linux kernel processed non-block size aligned requests. This could lead to random numbers being generated with less bits of entropy than expected when ANSI CPRNG was used.
(CVE-2013-4345, Moderate)

* It was found that the fix for CVE-2012-2375 released via RHSA-2012:1580 accidentally removed a check for small-sized result buffers. A local, unprivileged user with access to an NFSv4 mount with ACL support could use this flaw to crash the system or, potentially, escalate their privileges on the system . (CVE-2013-4591, Moderate)

* A flaw was found in the way IOMMU memory mappings were handled when moving memory slots. A malicious user on a KVM host who has the ability to assign a device to a guest could use this flaw to crash the host. (CVE-2013-4592, Moderate)

* Heap-based buffer overflow flaws were found in the way the Zeroplus and Pantherlord/GreenAsia game controllers handled HID reports. An attacker with physical access to the system could use these flaws to crash the system or, potentially, escalate their privileges on the system. (CVE-2013-2889, CVE-2013-2892, Moderate)

* Two information leak flaws were found in the logical link control (LLC) implementation in the Linux kernel. A local, unprivileged user could use these flaws to leak kernel stack memory to user space.
(CVE-2012-6542, CVE-2013-3231, Low)

* A heap-based buffer overflow in the way the tg3 Ethernet driver parsed the vital product data (VPD) of devices could allow an attacker with physical access to a system to cause a denial of service or, potentially, escalate their privileges. (CVE-2013-1929, Low)

* Information leak flaws in the Linux kernel could allow a privileged, local user to leak kernel memory to user space. (CVE-2012-6545, CVE-2013-1928, CVE-2013-2164, CVE-2013-2234, Low)

* A format string flaw was found in the Linux kernel's block layer. A privileged, local user could potentially use this flaw to escalate their privileges to kernel level (ring0). (CVE-2013-2851, Low)

Red Hat would like to thank Stephan Mueller for reporting CVE-2013-4345, and Kees Cook for reporting CVE-2013-2851.

This update also fixes several hundred bugs and adds enhancements.
Refer to the Red Hat Enterprise Linux 6.5 Release Notes for information on the most significant of these changes, and the Technical Notes for further information, both linked to in the References.

All Red Hat Enterprise Linux 6 users are advised to install these updated packages, which correct these issues, and fix the bugs and add the enhancements noted in the Red Hat Enterprise Linux 6.5 Release Notes and Technical Notes. The system must be rebooted for this update to take effect.

Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.4 Extended Update Support.

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

* A flaw was found in the way the Linux kernel's IPv6 implementation handled certain UDP packets when the UDP Fragmentation Offload (UFO) feature was enabled. A remote attacker could use this flaw to crash the system or, potentially, escalate their privileges on the system.
(CVE-2013-4387, Important)

* A flaw was found in the way the Linux kernel's TCP/IP protocol suite implementation handled sending of certain UDP packets over sockets that used the UDP_CORK option when the UDP Fragmentation Offload (UFO) feature was enabled on the output device. A local, unprivileged user could use this flaw to cause a denial of service or, potentially, escalate their privileges on the system. (CVE-2013-4470, Important)

* A divide-by-zero flaw was found in the apic_get_tmcct() function in KVM's Local Advanced Programmable Interrupt Controller (LAPIC) implementation. A privileged guest user could use this flaw to crash the host. (CVE-2013-6367, Important)

* A memory corruption flaw was discovered in the way KVM handled virtual APIC accesses that crossed a page boundary. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2013-6368, Important)

* A buffer overflow flaw was found in the way the qeth_snmp_command() function in the Linux kernel's QETH network device driver implementation handled SNMP IOCTL requests with an out-of-bounds length. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system.
(CVE-2013-6381, Important)

* It was found that the fix for CVE-2012-2375 released via RHSA-2012:1580 accidentally removed a check for small-sized result buffers. A local, unprivileged user with access to an NFSv4 mount with ACL support could use this flaw to crash the system or, potentially, escalate their privileges on the system. (CVE-2013-4591, Moderate)

* A format string flaw was found in the Linux kernel's block layer. A privileged, local user could potentially use this flaw to escalate their privileges to kernel level (ring0). (CVE-2013-2851, Low)

Red Hat would like to thank Hannes Frederic Sowa for reporting CVE-2013-4470, Andrew Honig of Google for reporting CVE-2013-6367 and CVE-2013-6368, and Kees Cook for reporting CVE-2013-2851.

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

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.

This update fixes the following security issues :

  - A flaw was found in the way the Linux kernel's IPv6     implementation handled certain UDP packets when the UDP     Fragmentation Offload (UFO) feature was enabled. A     remote attacker could use this flaw to crash the system     or, potentially, escalate their privileges on the     system. (CVE-2013-4387, Important)

  - A flaw was found in the way the Linux kernel handled the     creation of temporary IPv6 addresses. If the IPv6     privacy extension was enabled     (/proc/sys/net/ipv6/conf/eth0/use_tempaddr set to '2'),     an attacker on the local network could disable IPv6     temporary address generation, leading to a potential     information disclosure. (CVE-2013-0343, Moderate)

  - A flaw was found in the way the Linux kernel handled HID     (Human Interface Device) reports with an out-of-bounds     Report ID. An attacker with physical access to the     system could use this flaw to crash the system or,     potentially, escalate their privileges on the system.
    (CVE-2013-2888, Moderate)

  - An off-by-one flaw was found in the way the ANSI CPRNG     implementation in the Linux kernel processed non-block     size aligned requests. This could lead to random numbers     being generated with less bits of entropy than expected     when ANSI CPRNG was used. (CVE-2013-4345, Moderate)

  - It was found that the fix for CVE-2012-2375 released via     SLSA-2012:1580 accidentally removed a check for     small-sized result buffers. A local, unprivileged user     with access to an NFSv4 mount with ACL support could use     this flaw to crash the system or, potentially, escalate     their privileges on the system . (CVE-2013-4591,     Moderate)

  - A flaw was found in the way IOMMU memory mappings were     handled when moving memory slots. A malicious user on a     KVM host who has the ability to assign a device to a     guest could use this flaw to crash the host.
    (CVE-2013-4592, Moderate)

  - Heap-based buffer overflow flaws were found in the way     the Zeroplus and Pantherlord/GreenAsia game controllers     handled HID reports. An attacker with physical access to     the system could use these flaws to crash the system or,     potentially, escalate their privileges on the system.
    (CVE-2013-2889, CVE-2013-2892, Moderate)

  - Two information leak flaws were found in the logical     link control (LLC) implementation in the Linux kernel. A     local, unprivileged user could use these flaws to leak     kernel stack memory to user space. (CVE-2012-6542,     CVE-2013-3231, Low)

  - A heap-based buffer overflow in the way the tg3 Ethernet     driver parsed the vital product data (VPD) of devices     could allow an attacker with physical access to a system     to cause a denial of service or, potentially, escalate     their privileges. (CVE-2013-1929, Low)

  - Information leak flaws in the Linux kernel could allow a     privileged, local user to leak kernel memory to user     space. (CVE-2012-6545, CVE-2013-1928, CVE-2013-2164,     CVE-2013-2234, Low)

  - A format string flaw was found in the Linux kernel's     block layer. A privileged, local user could potentially     use this flaw to escalate their privileges to kernel     level (ring0). (CVE-2013-2851, Low)

The system must be rebooted for this update to take effect.

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-2585 advisory.

    - af_key: fix info leaks in notify messages (Mathias Krause) [Orabug: 17837974] {CVE-2013-2234}
    - drivers/cdrom/cdrom.c: use kzalloc() for failing hardware (Jonathan Salwan) [Orabug: 17837971]     {CVE-2013-2164}
    - fs/compat_ioctl.c: VIDEO_SET_SPU_PALETTE missing error check (Kees Cook) [Orabug: 17837966]     {CVE-2013-1928}
    - Bluetooth: RFCOMM - Fix info leak in ioctl(RFCOMMGETDEVLIST) (Mathias Krause) [Orabug: 17837959]     {CVE-2012-6545}
    - Bluetooth: RFCOMM - Fix info leak via getsockname() (Mathias Krause) [Orabug: 17838023] {CVE-2012-6545}
    - llc: Fix missing msg_namelen update in llc_ui_recvmsg() (Mathias Krause) [Orabug: 17837945]     {CVE-2013-3231}
    - HID: pantherlord: validate output report details (Kees Cook) [Orabug: 17837942] {CVE-2013-2892}
    - HID: zeroplus: validate output report details (Kees Cook) [Orabug: 17837936] {CVE-2013-2889}
    - NFSv4: Check for buffer length in __nfs4_get_acl_uncached (Sven Wegener) [Orabug: 17837931]     {CVE-2013-4591}
    - ansi_cprng: Fix off by one error in non-block size request (Neil Horman) [Orabug: 17837999]     {CVE-2013-4345}
    - HID: validate HID report id size (Kees Cook) [Orabug: 17837925] {CVE-2013-2888}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-1645 advisory.

    - [net] ipv6: udp packets following an UFO enqueued packet need also be handled by UFO (Jiri Pirko)     [1011930] {CVE-2013-4387}
    - [fs] compat_ioctl: VIDEO_SET_SPU_PALETTE missing error check (Phillip Lougher) [949573] {CVE-2013-1928}
    - [md] dm-snapshot: fix data corruption (Mikulas Patocka) [974481] {CVE-2013-4299}
    - [hid] pantherlord: heap overflow flaw (Radomir Vrbovsky) [1000435] {CVE-2013-2892}
    - [hid] zeroplus: validate output report details (Frantisek Hrbata) [999906] {CVE-2013-2889}
    - [hid] provide a helper for validating hid reports (Frantisek Hrbata) [999906] {CVE-2013-2889}
    - [crypto] ansi_cprng: Fix off by one error in non-block size request (Neil Horman) [1007694]     {CVE-2013-4345}
    - [bluetooth] rfcomm: Fix info leak in RFCOMMGETDEVLIST ioctl() (Radomir Vrbovsky) [922409]     {CVE-2012-6545}
    - [bluetooth] rfcomm: Fix info leak via getsockname() (Radomir Vrbovsky) [922409] {CVE-2012-6545}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
83611	SUSE SLES11 Security Update : kernel (SUSE-SU-2014:0287-1)	Nessus	SuSE Local Security Checks	high
79170	CentOS 6 : kernel (CESA-2013:1645)	Nessus	CentOS Local Security Checks	medium
79000	RHEL 6 : kernel (RHSA-2014:0284)	Nessus	Red Hat Local Security Checks	medium
71490	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20131121)	Nessus	Scientific Linux Local Security Checks	medium
71134	Oracle Linux 5 / 6 : Unbreakable Enterprise Kernel (ELSA-2013-2585)	Nessus	Oracle Linux Local Security Checks	medium
71108	Oracle Linux 6 : kernel (ELSA-2013-1645)	Nessus	Oracle Linux Local Security Checks	medium
71013	RHEL 6 : kernel (RHSA-2013:1645)	Nessus	Red Hat Local Security Checks	medium

Detections

Analytics

CVE-2013-4591

high

Tenable Plugins

high

medium

medium

medium

medium

medium

medium