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Linux Kernel Multiple Vulnerabilities

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Release Date:  2009-09-17    Last Update:  2009-10-30    Views:  3,927

Secunia Advisory SA36763

Where:

From remote

Impact:

Security Bypass, Privilege escalation, DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions, cause a DoS (Denial of Service), and gain escalated privileges and by malicious people to cause a DoS.

1) An error exists within the "find_ie()" function in net/wireless/scan.c, which can be exploited to trigger an infinite loop by sending specially crafted packets.

Note: This does not affect versions prior to 2.6.30.

2) A boundary error within the "perf_copy_attr()" function in kernel/perf_counter.c can be exploited to cause a buffer overflow by e.g. passing specially crafted data via the "perf_counter_open()" syscall.

Note: This does not affect versions prior to 2.6.31.

3) The "kvm_emulate_hypercall()" function in arch/x86/kvm/x86.c does not reject MMU hypercalls from unprivileged guests, which can be exploited to e.g. crash a guest kernel.

4) The "handle_dr()" function in arch/x86/kvm/vmx.c does not properly check the current privilege level before emulating access to debug registers, which can be exploited to e.g. set hardware breakpoints from userspace.


Solution:
Update to version 2.6.31.1.

Provided and/or discovered by:
1) Bob Copeland
2) Xiao Guangrong
3) Jan Kiszka
4) Reported by the vendor.

Original Advisory:
1) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=fcc6cb0c13555e78c2d47257b6d1b5e59b0c419a
2) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b3e62e35058fc744ac794611f4e79bcd1c5a4b83
3) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=07708c4af1346ab1521b26a202f438366b7bcffd
4) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=0a79b009525b160081d75cef5dbf45817956acf2

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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