The log_prefix function in kernel/printk.c in the Linux kernel 3.x before 3.4.33 does not properly remove a prefix string from a syslog header, which allows local users to cause a denial of service (buffer overflow and system crash) by leveraging /dev/kmsg write access and triggering a call_console_drivers function call.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:0566 advisory.

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

    This update fixes the following security issues:

    * A buffer overflow flaw was found in the way UTF-8 characters were     converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's     FAT file system implementation. A local user able to mount a FAT file     system with the utf8=1 option could use this flaw to crash the system or,     potentially, to escalate their privileges. (CVE-2013-1773, Important)

    * It was found that the RHSA-2012:0333 update did not correctly fix the     CVE-2011-4131 issue. A malicious Network File System version 4 (NFSv4)     server could return a crafted reply to a GETACL request, causing a denial     of service on the client. (CVE-2012-2375, Moderate)

    * A memory disclosure flaw was found in the way the load_script() function     in the binfmt_script binary format handler handled excessive recursions. A     local, unprivileged user could use this flaw to leak kernel stack memory to     user-space by executing specially-crafted scripts. (CVE-2012-4530, Low)

    * A flaw was found in the way file permission checks for the /dev/kmsg     file were performed in restricted root environments (for example, when     using a capability-based security model). A local user able to write to     this file could cause a denial of service. (CVE-2013-1772, Low)

    The CVE-2012-2375 issue was discovered by Jian Li of Red Hat.

    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-3.6.11-rt28, correct these issues, and fix the     bugs noted in the Red Hat Enterprise MRG 2 Technical Notes. The system must     be rebooted for this update to take effect.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-2546 advisory.

  - The mmc_ioctl_cdrom_read_data function in drivers/cdrom/cdrom.c in the Linux kernel through 3.10 allows     local users to obtain sensitive information from kernel memory via a read operation on a malfunctioning     CD-ROM drive. (CVE-2013-2164)

  - The (1) key_notify_sa_flush and (2) key_notify_policy_flush functions in net/key/af_key.c in the Linux     kernel before 3.10 do not initialize certain structure members, which allows local users to obtain     sensitive information from kernel heap memory by reading a broadcast message from the notify interface of     an IPSec key_socket. (CVE-2013-2234)

  - The isofs_export_encode_fh function in fs/isofs/export.c in the Linux kernel before 3.6 does not     initialize a certain structure member, which allows local users to obtain sensitive information from     kernel heap memory via a crafted application. (CVE-2012-6549)

  - The log_prefix function in kernel/printk.c in the Linux kernel 3.x before 3.4.33 does not properly remove     a prefix string from a syslog header, which allows local users to cause a denial of service (buffer     overflow and system crash) by leveraging /dev/kmsg write access and triggering a call_console_drivers     function call. (CVE-2013-1772)

  - The dispatch_discard_io function in drivers/block/xen-blkback/blkback.c in the Xen blkback implementation     in the Linux kernel before 3.10.5 allows guest OS users to cause a denial of service (data loss) via     filesystem write operations on a read-only disk that supports the (1) BLKIF_OP_DISCARD (aka discard or     TRIM) or (2) SCSI UNMAP feature. (CVE-2013-2140)

  - The crypto API in the Linux kernel through 3.9-rc8 does not initialize certain length variables, which     allows local users to obtain sensitive information from kernel stack memory via a crafted recvmsg or     recvfrom system call, related to the hash_recvmsg function in crypto/algif_hash.c and the skcipher_recvmsg     function in crypto/algif_skcipher.c. (CVE-2013-3076)

  - The ip6_append_data_mtu function in net/ipv6/ip6_output.c in the IPv6 implementation in the Linux kernel     through 3.10.3 does not properly maintain information about whether the IPV6_MTU setsockopt option had     been specified, which allows local users to cause a denial of service (BUG and system crash) via a crafted     application that uses the UDP_CORK option in a setsockopt system call. (CVE-2013-4163)

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

ID	Name	Product	Family	Severity
76658	RHEL 6 : kernel-rt (RHSA-2013:0566)	Nessus	Red Hat Local Security Checks	high
69942	Oracle Linux 5 / 6 : Unbreakable Enterprise Kernel (ELSA-2013-2546)	Nessus	Oracle Linux Local Security Checks	high
66344	SuSE 11.2 Security Update : Linux kernel (SAT Patch Numbers 7667 / 7669 / 7675)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2013-1772

medium

Tenable Plugins

high

high

high