Bug 447974 - (CVE-2008-0960) CVE-2008-0960 net-snmp SNMPv3 authentication bypass (VU#877044)
CVE-2008-0960 net-snmp SNMPv3 authentication bypass (VU#877044)
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,source=cert,reported=...
: Security
Depends On: 449893 449894 449895 449896 449897 449898 449899
Blocks:
  Show dependency treegraph
 
Reported: 2008-05-22 14:17 EDT by Josh Bressers
Modified: 2011-09-29 22:00 EDT (History)
5 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2011-09-29 22:00:44 EDT
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Attachments (Terms of Use)
Proposed upstream patch (389 bytes, patch)
2008-05-22 14:17 EDT, Josh Bressers
no flags Details | Diff

  None (edit)
Description Josh Bressers 2008-05-22 14:17:37 EDT
CERT has told us of an authentication bypass flaw in Net-SNMP and UCD-SNMP.

According to net-snmp:

"The quick technical summary is that the SNMPv3 packet contains a truncated HMAC
authentication code. The author that wrote the code very very long ago to check
that HMAC code used the length of the packet's version of the HMAC code to do
the check. Thus if you send a single byte HMAC code, it'll only check it against
the first byte of HMAC output. Thus it's fairly easy to spoof an authenticated
SNMPv3 packet."
Comment 1 Josh Bressers 2008-05-22 14:17:37 EDT
Created attachment 306408 [details]
Proposed upstream patch
Comment 2 Mark J. Cox (Product Security) 2008-06-04 03:27:41 EDT
changing embargo date due to request from CERT
Comment 10 Tomas Hoger 2008-06-10 02:19:57 EDT
Public now, lifting embargo:

  http://www.ocert.org/advisories/ocert-2008-006.html
  http://sourceforge.net/forum/forum.php?forum_id=833770

Net-SNMP upstream bug report: 
http://sourceforge.net/tracker/index.php?func=detail&aid=1989089&group_id=12694&atid=456380

Fixed Net-SNMP versions:
>= 5.4.1.1, >= 5.3.2.1, >= 5.2.4.1
Comment 11 Fedora Update System 2008-06-11 00:39:20 EDT
net-snmp-5.4.1-18.fc9 has been pushed to the Fedora 9 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 12 Fedora Update System 2008-06-11 00:39:31 EDT
net-snmp-5.4.1-7.fc8 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 13 Fedora Update System 2008-06-11 00:39:48 EDT
net-snmp-5.4-18.fc7 has been pushed to the Fedora 7 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 14 Tomas Hoger 2008-06-13 13:41:19 EDT
Public PoC:

  http://lab.mediaservice.net/code.php#snmpv3
Comment 15 Kurt Seifried 2011-09-29 22:00:44 EDT
All children bugs have been closed, parent is no longer needed.

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