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Linux Kernel IP ID Value Increment Weakness
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Secunia Advisory:
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SA19402
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Release Date:
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2006-03-28
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Popularity:
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11,904 views
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Critical:
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Not critical
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Impact:
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Security Bypass
Exposure of system information
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Where:
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From remote
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Solution Status:
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Partial Fix
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| OS: | Linux Kernel 2.4.x
Linux Kernel 2.6.x
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| CVE reference: | CVE-2006-1242
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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
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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