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Net-SNMP HMAC Authentication Spoofing Vulnerability
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Secunia Advisory:
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SA30574
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Release Date:
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2008-06-10
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Last Update:
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2008-06-11
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Popularity:
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5,391 views
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Critical:
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Less critical
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Impact:
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Spoofing
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| Software: | Net-snmp 5.x
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| CVE reference: | CVE-2008-0960
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Description:
A vulnerability has been reported in Net-SNMP, which can be exploited by malicious people to spoof authenticated SNMPv3 packets.
The vulnerability is caused due to an error within the verification of the HMAC digest. This can be exploited to increase the chance of successfully spoofing a packet to 1 in 256 by sending a specially crafted SNMPv3 packet with an incomplete 1 byte HMAC digest.
Successful exploitation requires a valid username.
The vulnerability is reported in versions prior to 5.4.1.1 of the 5.4.x branch, 5.3.2.1 of the 5.3.x branch, and 5.2.4.1 of the 5.2.x branch.
Solution:
Update to version 5.4.1.1, 5.3.2.1, or 5.2.4.1.
Provided and/or discovered by:
US-CERT credits Wes Hardaker, Net-SNMP
Changelog:
2008-06-11: Updated "Credits" section with new information provided by US-CERT.
Original Advisory:
Net-SNMP:
http://sourceforge.net/forum/forum.php?forum_id=833770
US-CERT VU#878044:
http://www.kb.cert.org/vuls/id/878044
Other References:
oCERT:
http://www.ocert.org/advisories/ocert-2008-006.html
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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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