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Linux Kernel Multiple Denial of Service Vulnerabilities
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Secunia Advisory:
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SA24618
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Release Date:
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2007-03-23
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Last Update:
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2007-04-17
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Popularity:
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10,810 views
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| OS: | Linux Kernel 2.6.x
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| CVE reference: | CVE-2007-1592
CVE-2007-1388
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Description:
Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service).
1) Listening IPv6 TCP sockets are incorrectly sharing the "ipv6_fl_socklist" IPv6 flowlist with child sockets. This can be exploited to e.g. cause a kernel crash by performing certain actions on IPv6 TCP sockets.
2) The "hrtimer_forward()" does not correctly check for "timer->expires" overflows on 64bit machines. This can be exploited to cause a DoS by using very large timer values.
Successful exploitation may require a 64bit machine and that high resolution timers are enabled.
3) A NULL pointer dereference within the "do_ipv6_setsockopt()" function in net/ipv6/ipv6_sockglue.c can be exploited to cause a kernel crash by calling "setsockopt()" with malicious parameters.
The vulnerabilities are reported in versions prior to 2.6.20.4.
Solution:
Update to version 2.6.20.4.
Provided and/or discovered by:
1) Reported by the vendor.
2) Johannes Bauer
3) Gabriel Campana
Changelog:
2007-03-26: Updated "Solution" section. Updated advisory with vulnerabilities #2 and #3.
2007-04-17: Added CVE references.
Original Advisory:
http://marc.info/?l=linux-netdev&m=117406721731891&w=2
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20.4
Other References:
1) http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=233478
2) http://lkml.org/lkml/2007/3/13/285
3) http://bugzilla.kernel.org/show_bug.cgi?id=8155
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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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