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OpenBSD TCP Retransmission Timeout Calculation Denial of Service
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Secunia Advisory:
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SA13819
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Release Date:
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2005-01-13
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Last Update:
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2005-03-14
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Critical:
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Not 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: | OpenBSD 3.x
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| | CVE reference: | CVE-2005-0740 (Secunia mirror)
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Description:
A vulnerability has been reported in OpenBSD, which can be exploited by malicious, local users to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in the TCP stack when calculating TCP retransmission timeouts. This can be exploited to crash the system by sending some specially crafted packets with specific values in the TCP timestamp option.
Solution:
Apply patches.
OpenBSD 3.6:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.6/common/010_rtt.patch
OpenBSD 3.5:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.5/common/027_rtt.patch
Provided and/or discovered by:
Reported by vendor.
Changelog:
2005-03-14: Added CVE reference.
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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.
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