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Linux Kernel "vmsplice()" System Call Vulnerabilities

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Release Date:  2008-02-11    Views:  31,318

Secunia Advisory SA28835

Where:

Local system

Impact:

Exposure of sensitive information, 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 cause a DoS (Denial of Service), disclose potentially sensitive information, and gain escalated privileges.

The vulnerabilities are caused due to the missing verification of parameters within the "vmsplice_to_user()", "copy_from_user_mmap_sem()", and "get_iovec_page_array()" functions in fs/splice.c before using them to perform certain memory operations. This can be exploited to e.g. read or write to arbitrary kernel memory via a specially crafted "vmsplice()" system call.

Successful exploitation allows attackers to e.g. gain "root" privileges.

Note: The affected system call first appeared in version 2.6.17.


Solution:
Update to version 2.6.23.16 or 2.6.24.2.

Provided and/or discovered by:
Wojciech Purczynskiof iSEC Security Research and qaaz

Original Advisory:
iSEC Security Research:
http://www.isec.pl/vulnerabilities/isec-0026-vmsplice_to_kernel.txt

qaaz:
http://milw0rm.com/exploits/5092
http://milw0rm.com/exploits/5093

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 "vmsplice()" System Call Vulnerabilities

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