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Linux Kernel 2.0 Information Leak
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Secunia Advisory:
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SA8991
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Release Date:
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2003-06-11
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Popularity:
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7,599 views
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Critical:
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Moderately critical
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Impact:
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Exposure of sensitive information
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | Linux Kernel 2.0.x
WatchGuard Firebox 1000
WatchGuard Firebox 2500
WatchGuard Firebox 4500
WatchGuard Firebox 700
WatchGuard Firebox II 4.x
WatchGuard Firebox II 5.x
WatchGuard Firebox II 6.x
WatchGuard Firebox III series
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Description:
A vulnerability has been identified in Linux Kernel 2.0 branch allowing malicious people to see random parts of the memory.
The problem is that the Linux Kernel fails to calculate the size for an ICMP error response. This causes the Linux Kernel to return too much data when sending ICMP errors.
The data which is returned by the Kernel appears to be random data from memory. This could lead to exposure of passwords, system configuration and more.
Apparently, there is no way for a malicious person to control what parts of memory the data comes from.
Linux Kernel versions 2.0 to 2.0.39 are vulnerable.
WatchGuard FireBox II and III are vulnerable.
Solution:
It has been reported that Linux Kernel version 2.0.40 soon will be released.
Secunia strongly recommends the use of Linux kernel 2.4 branch instead, as it provides better IP filtering support. Furthermore, most Linux distributions only support releases with 2.2 or 2.4 branch kernels.
Steve Fallin, director of WatchGuard Rapid Response Team, has said that bug fixes will be available early third quarter 2003.
Implement a filter that disallow ICMP error messages.
Provided and/or discovered by:
Philippe Biondi, Cartel Sécurité.
Original Advisory:
http://www.cartel-securite.fr/pbiondi/adv/CARTSA-20030314-icmpleak.txt
Other References:
http://www.kb.cert.org/vuls/id/471084
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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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