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>> Linux Kernel PPP Over X/Ethernet Sockets Local Denial of Service Vulnerability

Title : Linux Kernel PPP Over X/Ethernet Sockets Local Denial of Service Vulnerability
VUPEN ID : VUPEN/ADV-2007-1703
CVE ID : CVE-2007-2525
Rated as : Low Risk 
Remotely Exploitable : No
Locally Exploitable : Yes
Release Date : 2007-05-08


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 

A vulnerability has been identified in Linux Kernel, which could be exploited by malicious users to cause a denial of service. This issue is caused by memory leak error in the "pppox_unbind_sock()" [drivers/net/pppox.c] function when releasing a connected PPPoE socket before calling the "PPPIOCGCHAN" ioctl, which could be exploited by local attackers to exhaust all available memory resources, creating a denial of service condition.

Affected Products

Linux Kernel versions 2.6.x

Solution

Apply patch :
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=202a03acf9994076055df40ae093a5c5474ad0bd

References

http://www.vupen.com/english/advisories/2007/1703
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.21-git8.log

Credits

Vulnerability reported by the vendor

ChangeLog

2007-05-08 : Initial release

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