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Insecure Library Loading
Moderately critical

Linux Kernel Multiple Vulnerabilities

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Release Date:  2011-06-03    Last Update:  2013-01-11    Views:  3,660

Secunia Advisory SA44754

Where:

From remote

Impact:

Exposure of system information, Privilege escalation, DoS, System access

Solution Status:

Partial Fix

Operating System:

CVE Reference(s):

Description


Multiple vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose certain system information, cause a DoS (Denial of Service), and gain escalated privileges and by malicious people to potentially compromise a vulnerable system.

1) A race condition within the "scan_get_next_rmap_item()" function in mm/ksm.c and can be exploited to cause a kernel crash.

2) A signedness error when processing the "osf_sysinfo()" system call in arch/alpha/kernel/osf_sys.c can be exploited to disclose the contents of some kernel memory.

3) A signedness error when processing the "osf_getdomainname()" system call in arch/alpha/kernel/osf_sys.c can be exploited to disclose the contents of some kernel memory.

4) An error when processing the "osf_getsysinfo()" system call in arch/alpha/kernel/osf_sys.c can be exploited to disclose the contents of some kernel memory.

5) An error when processing the "osf_wait4()" system call in arch/alpha/kernel/osf_sys.c can be exploited to manipulate kernel memory.

NOTE: The vulnerabilities #2 through #5 affect the Alpha architecture only.

6) An error within the INET socket monitoring feature when auditing the bytecode contained in certain netlink messages can be exploited to cause the kernel to enter an infinite loop via an INET_DIAG_BC_JMP opcode with the "yes" variable set to "0".

7) An error due to the TASKSTATS netlink interface (kernel/taskstats.c) allowing a process to register multiple listeners for exit statistics, which can be exploited to cause the kernel to consume memory and CPU resources resulting in a DoS.

8) An integer underflow error within the "l2cap_config_req()" function in net/bluetooth/l2cap_core.c when handling a l2cap configuration request can be exploited to cause a buffer overflow.

9) Some errors in net/wireless/nl80211.c when processing SSID strings can be exploited to cause a buffer overflow via an overly long string.

Successful exploitation of this vulnerability requires "CAP_NET_ADMIN" capabilities.

10) The "packet_recvmsg()" and "tpacket_rcv()" functions (net/packet/af_packet.c) do not properly initialise a structure before copying it to userspace, which can be exploited to disclose kernel memory.

The vulnerabilities are reported in version 2.6.39.1. Other versions may also be affected.


Solution:
Vulnerabilities #1 through #7 are fixed in version 2.6.39.4 and 2.6.35.14. Vulnerability #10 is fixed in version 2.6.35.14.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Andrea Righi
2 - 6, 8) Dan Rosenberg
7) Vasiliy Kulikov
10) Disclosed in a GIT commit.

Original Advisory:
Kernel:
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.4
http://ftp.kernel.org/pub/linux/kernel/v2.6/longterm/v2.6.35/ChangeLog-2.6.35.14

Andrea Righi:
https://lkml.org/lkml/2011/6/1/742

Dan Rosenberg:
https://lkml.org/lkml/2011/6/11/87
http://thread.gmane.org/gmane.linux.network/197206/focus=197386
http://marc.info/?l=linux-kernel&m=130891911909436&w=2

Vasiliy Kulikov:
http://seclists.org/oss-sec/2011/q2/664

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel Multiple Vulnerabilities

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