Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or leak sensitive data. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2008-3272     Tobias Klein reported a locally exploitable data leak in     the snd_seq_oss_synth_make_info() function. This may     allow local users to gain access to sensitive     information.

  - CVE-2008-3275     Zoltan Sogor discovered a coding error in the VFS that     allows local users to exploit a kernel memory leak     resulting in a denial of service.

  - CVE-2008-3276     Eugene Teo reported an integer overflow in the DCCP     subsystem that may allow remote attackers to cause a     denial of service in the form of a kernel panic.

  - CVE-2008-3526     Eugene Teo reported a missing bounds check in the SCTP     subsystem. By exploiting an integer overflow in the     SCTP_AUTH_KEY handling code, remote attackers may be     able to cause a denial of service in the form of a     kernel panic.

  - CVE-2008-3534     Kel Modderman reported an issue in the tmpfs filesystem     that allows local users to crash a system by triggering     a kernel BUG() assertion.

  - CVE-2008-3535     Alexey Dobriyan discovered an off-by-one-error in the     iov_iter_advance function which can be exploited by     local users to crash a system, resulting in a denial of     service.

  - CVE-2008-3792     Vlad Yasevich reported several NULL pointer reference     conditions in the SCTP subsystem that can be triggered     by entering sctp-auth codepaths when the AUTH feature is     inactive. This may allow attackers to cause a denial of     service condition via a system panic.

  - CVE-2008-3915     Johann Dahm and David Richter reported an issue in the     nfsd subsystem that may allow remote attackers to cause     a denial of service via a buffer overflow.

This patch updates the openSUSE 11.0 kernel to the 2.6.25.18 stable release.

It also includes bugfixes and security fixes :

CVE-2008-4410: The vmi_write_ldt_entry function in arch/x86/kernel/vmi_32.c in the Virtual Machine Interface (VMI) in the Linux kernel 2.6.26.5 invokes write_idt_entry where write_ldt_entry was intended, which allows local users to cause a denial of service (persistent application failure) via crafted function calls, related to the Java Runtime Environment (JRE) experiencing improper LDT selector state.

sctp: Fix kernel panic while process protocol violation parameter.

CVE-2008-3528: The ext[234] filesystem code fails to properly handle corrupted data structures. With a mounted filesystem image or partition that have corrupted dir->i_size and dir->i_blocks, a user performing either a read or write operation on the mounted image or partition can lead to a possible denial of service by spamming the logfile.

CVE-2008-3526: Integer overflow in the sctp_setsockopt_auth_key function in net/sctp/socket.c in the Stream Control Transmission Protocol (sctp) implementation in the Linux kernel allows remote attackers to cause a denial of service (panic) or possibly have unspecified other impact via a crafted sca_keylength field associated with the SCTP_AUTH_KEY option.

CVE-2008-3525: Added missing capability checks in sbni_ioctl().

CVE-2008-4576: SCTP in Linux kernel before 2.6.25.18 allows remote attackers to cause a denial of service (OOPS) via an INIT-ACK that states the peer does not support AUTH, which causes the sctp_process_init function to clean up active transports and triggers the OOPS when the T1-Init timer expires.

CVE-2008-4445: The sctp_auth_ep_set_hmacs function in net/sctp/auth.c in the Stream Control Transmission Protocol (sctp) implementation in the Linux kernel before 2.6.26.4, when the SCTP-AUTH extension is enabled, does not verify that the identifier index is within the bounds established by SCTP_AUTH_HMAC_ID_MAX, which allows local users to obtain sensitive information via a crafted SCTP_HMAC_IDENT IOCTL request involving the sctp_getsockopt function.

CVE-2008-3792: net/sctp/socket.c in the Stream Control Transmission Protocol (sctp) implementation in the Linux kernel 2.6.26.3 does not verify that the SCTP-AUTH extension is enabled before proceeding with SCTP-AUTH API functions, which allows attackers to cause a denial of service (panic) via vectors that result in calls to (1) sctp_setsockopt_auth_chunk, (2) sctp_setsockopt_hmac_ident, (3) sctp_setsockopt_auth_key, (4) sctp_setsockopt_active_key, (5) sctp_setsockopt_del_key, (6) sctp_getsockopt_maxburst, (7) sctp_getsockopt_active_key, (8) sctp_getsockopt_peer_auth_chunks, or (9) sctp_getsockopt_local_auth_chunks.

CVE-2008-4113: The sctp_getsockopt_hmac_ident function in net/sctp/socket.c in the Stream Control Transmission Protocol (sctp) implementation in the Linux kernel before 2.6.26.4, when the SCTP-AUTH extension is enabled, relies on an untrusted length value to limit copying of data from kernel memory, which allows local users to obtain sensitive information via a crafted SCTP_HMAC_IDENT IOCTL request involving the sctp_getsockopt function.

CVE-2008-3911: The proc_do_xprt function in net/sunrpc/sysctl.c in the Linux kernel 2.6.26.3 does not check the length of a certain buffer obtained from userspace, which allows local users to overflow a stack-based buffer and have unspecified other impact via a crafted read system call for the /proc/sys/sunrpc/transports file.

It was discovered that the direct-IO subsystem did not correctly validate certain structures. A local attacker could exploit this to cause a system crash, leading to a denial of service. (CVE-2007-6716)

It was discovered that the disabling of the ZERO_PAGE optimization could lead to large memory consumption. A local attacker could exploit this to allocate all available memory, leading to a denial of service.
(CVE-2008-2372)

It was discovered that the Datagram Congestion Control Protocol (DCCP) did not correctly validate its arguments. If DCCP was in use, a remote attacker could send specially crafted network traffic and cause a system crash, leading to a denial of service. (CVE-2008-3276)

It was discovered that the SBNI WAN driver did not correctly check for the NET_ADMIN capability. A malicious local root user lacking CAP_NET_ADMIN would be able to change the WAN device configuration, leading to a denial of service. (CVE-2008-3525)

It was discovered that the Stream Control Transmission Protocol (SCTP) did not correctly validate the key length in the SCTP_AUTH_KEY option.
If SCTP is in use, a remote attacker could send specially crafted network traffic that would crash the system, leading to a denial of service. (CVE-2008-3526)

It was discovered that the tmpfs implementation did not correctly handle certain sequences of inode operations. A local attacker could exploit this to crash the system, leading to a denial of service.
(CVE-2008-3534)

It was discovered that the readv/writev functions did not correctly handle certain sequences of file operations. A local attacker could exploit this to crash the system, leading to a denial of service.
(CVE-2008-3535)

It was discovered that SCTP did not correctly validate its userspace arguments. A local attacker could call certain sctp_* functions with malicious options and cause a system crash, leading to a denial of service. (CVE-2008-3792, CVE-2008-4113, CVE-2008-4445)

It was discovered the the i915 video driver did not correctly validate memory addresses. A local attacker could exploit this to remap memory that could cause a system crash, leading to a denial of service.
(CVE-2008-3831)

Johann Dahm and David Richter discovered that NFSv4 did not correctly handle certain file ACLs. If NFSv4 is in use, a local attacker could create a malicious ACL that could cause a system crash, leading to a denial of service. (CVE-2008-3915).

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.

ID	Name	Product	Family	Published	Updated	Severity
34171	Debian DSA-1636-1 : linux-2.6.24 - denial of service/information leak	Nessus	Debian Local Security Checks	9/12/2008	1/4/2021	high
40010	openSUSE Security Update : kernel (kernel-270)	Nessus	SuSE Local Security Checks	7/21/2009	1/14/2021	high
36681	Ubuntu 6.06 LTS / 7.10 / 8.04 LTS : linux, linux-source-2.6.15/22 vulnerabilities (USN-659-1)	Nessus	Ubuntu Local Security Checks	4/23/2009	1/19/2021	high

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