Bug 447974 (CVE-2008-0960)

Summary: CVE-2008-0960 net-snmp SNMPv3 authentication bypass (VU#877044)
Product: [Other] Security Response Reporter: Josh Bressers <bressers>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: eric, jsafrane, kreilly, kseifried, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-09-30 02:00:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 449893, 449894, 449895, 449896, 449897, 449898, 449899    
Bug Blocks:    
Attachments:
Description Flags
Proposed upstream patch none

Description Josh Bressers 2008-05-22 18:17:37 UTC 
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 18:17:37 UTC 
Created attachment 306408 [details]
Proposed upstream patch
Comment 2 Mark J. Cox 2008-06-04 07:27:41 UTC 
changing embargo date due to request from CERT
Comment 10 Tomas Hoger 2008-06-10 06:19:57 UTC 
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 04:39:20 UTC 
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 04:39:31 UTC 
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 04:39:48 UTC 
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 17:41:19 UTC 
Public PoC:

  http://lab.mediaservice.net/code.php#snmpv3
Comment 15 Kurt Seifried 2011-09-30 02:00:44 UTC 
All children bugs have been closed, parent is no longer needed.