Secunia CSI7
Advisories
Research
Forums
Create Profile
Our Commitment
Database
Search
Advisories by Product
Advisories by Vendor
Terminology
Report Vulnerability
Insecure Library Loading
Moderately critical

Linux Kernel Security Bypass and Multiple Denial of Service Vulnerabilities

-

Release Date:  2007-07-09    Last Update:  2008-07-21    Views:  15,366

Secunia Advisory SA25955

Where:

From remote

Impact:

Security Bypass, 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 and cause a DoS (Denial of Service), and malicious people to cause a DoS.

1) An error within the "decode_choice()" function in net/netfilter/bf_conntrack_h323_asn1.c when handling choices that are still encoded in the fixed-size bitfield can be exploited to cause access to undefined types, resulting in a crash.

2) MSR bits are cleared after copying the state into the thread_struct. This can be exploited to cause corruption of the floating point state after returning from signal handlers, resulting in a DoS.

Successful exploitation requires a PowerPC based architecture.

3) The "do_change_type()" function in fs/namespace.c does not properly check for "CAP_SYS_ADMIN" privileges before performing certain operations. This can be exploited to e.g. mark private mounts as shared or mark a mount as unbindable.


Solution:
Update to version 2.6.22.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Zhongling Wen
2) Reported by the vendor
3) Reported in a Red Hat bug.

Original Advisory:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22

3) https://bugzilla.redhat.com/show_bug.cgi?id=454388

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 Security Bypass and Multiple Denial of Service Vulnerabilities

No posts yet

-

You must be logged in to post a comment.



 Products Solutions Customers Partner Resources Company
 
 Corporate
Vulnerability Intelligence Manager (VIM)
Corporate Software Inspector (CSI)
Consumer
Personal Software Inspector (PSI)
Online Software Inspector (OSI)
 Industry
Compliance
Technology
Integration
 Customers
Testimonials
 VARS
MSSP
Technology Partners
References
 Factsheets
Reports
Webinars
Events
 About us
Careers
Memberships
Newsroom


 
© 2002-2014 Secunia ApS - Rued Langgaards Vej 8, 4th floor, DK-2300 Copenhagen, Denmark - +45 7020 5144
Terms & Conditions and Copyright - Privacy - Report Vulnerability