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>> Linux Kernel "vmsplice" Multiple Local Privilege Escalation Vulnerabilities

Title : Linux Kernel "vmsplice" Multiple Local Privilege Escalation Vulnerabilities
VUPEN ID : VUPEN/ADV-2008-0487
CVE ID : CVE-2008-0009 - CVE-2008-0010 - CVE-2008-0600
Rated as : Moderate Risk 
Remotely Exploitable : No
Locally Exploitable : Yes
Release Date : 2008-02-11


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format 

Multiple vulnerabilities have been identified in Linux Kernel, which could be exploited by local attackes to bypass security restrictions and obtain elevated privileges. These issues are caused by errors in the "vmsplice_to_user()", "copy_from_user_mmap_sem()", and "get_iovec_page_array()" [fs/splice.c] functions that do not validate user-supplied data before being used, which could be exploited by malicious users to read or write arbitrary memory data, and execute malicious code with elevated privileges.

Affected Products

Linux Kernel versions 2.6.x

Solution

Upgrade to Linux Kernel version 2.6.24.2, 2.6.23.16 or 2.6.22.18 :
http://www.kernel.org/

References

http://www.vupen.com/english/advisories/2008/0487
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.24.2
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.24.1
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23.16
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23.15
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22.18
http://www.isec.pl/vulnerabilities/isec-0026-vmsplice_to_kernel.txt

Credits

Vulnerabilities reported by Wojciech Purczynski (COSEINC PTE) and qaaz.

ChangeLog

2008-02-11 : Initial release
2008-02-12 : Updated Solution

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