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Linux Kernel IP ID Value Increment Weakness Advisory Available in Danish 

Secunia Advisory: SA19402  
Release Date: 2006-03-28

Critical:
Not critical
Impact: Security Bypass
Exposure of system information
Where: From remote
Solution Status: Partial Fix

OS:Linux Kernel 2.4.x
Linux Kernel 2.6.x


CVE reference:CVE-2006-1242 (Secunia mirror)



Description:
Marco Ivaldi has reported a weakness in the Linux kernel, which can be exploited by malicious people to disclose certain system information and potentially to bypass certain security restrictions.

The weakness is caused due to an error within the "ip_push_pending_frames()" function when creating a packet in reply to a received SYN/ACK packet. This causes RST packets to be sent with a IP ID value that is incremented per packet. This can potentially be exploited to conduct idle scan attacks.

The weakness has been reported in the 2.4 and 2.6 kernel branches.

Solution:
Update to version 2.6.16.1.
http://www.kernel.org/

Secunia is currently not aware of any official patches for the 2.4 kernel.

Provided and/or discovered by:
Marco Ivaldi

Original Advisory:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.1
http://www.kernel.org/git/?p=linux/ke...8133bf7a06845afee5bcdff7c276bbceaaf55



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

186 Related Secunia Security Advisories, displaying 10

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5. Linux Kernel Multiple Vulnerabilities
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7. Linux Kernel ASN.1 BER Decoding Vulnerability
8. Linux Kernel Denial of Service Vulnerabilities
9. Linux Kernel Unspecified Vulnerability
10. Linux Kernel Multiple Vulnerabilities

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