Bug 225105 (CVE-2008-0960) – net-analyzer/net-snmp <5.4.1.1 truncated HMAC authentication code (CVE-2008-0960)

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description Matthias Geerdsen (RETIRED) 2008-06-06 10:50:14 UTC]

** Please note that this issue is confidential at the moment and no information
should be disclosed until it is made public **

We have been contacted by CERT/CC about the following issue:
<quote>
According to net-snmp project:

"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.
</quote>

[Comment 1 Matthias Geerdsen (RETIRED) 2008-06-06 10:51:54 UTC]

Created attachment 155709 [details, diff]
patch for CVE-2008-0960

[Comment 2 Matthias Geerdsen (RETIRED) 2008-06-06 10:53:44 UTC]

pva/falco/vapier since you are all in netmon herd anyways, please prepare an ebuild with the patch and attach it here.

Do not commit anything to the tree until this issue is made public.

[Comment 3 Peter Volkov (RETIRED) 2008-06-06 19:26:32 UTC]

Created attachment 155745 [details, diff]
net-snmp-5.4.1-CVE-2008-0960.patch

Thank you Matthias. Attached patch was corrupted one. Attaching correct one.

[Comment 4 Peter Volkov (RETIRED) 2008-06-06 19:30:09 UTC]

BTW, I don't see any rush with this security fix. I'm going to bump net-snmp now to fix quite a number of bugs, after that I'd like to have at least 2 weeks for feedback on patches I've backported from upstream and only after that stabilize this package... Also we have another security fix for this package in queue so it's better to test stabilize them together, I suppose.

[Comment 5 Robert Buchholz (RETIRED) 2008-06-10 01:07:25 UTC]

Now public via URL.
"Fixed version:
Net-SNMP >= 5.4.1.1, >= 5.3.2.1, >= 5.2.4.1"

Peter, take the time you want to test this issue, 

[Comment 6 Peter Volkov (RETIRED) 2008-06-21 06:40:30 UTC]

5.4.1.1 is ready to go stable together with autoconf-2.61-r2 (which should be stabilized in bug 227603).

Target keywords:
net-analyzer/net-snmp-5.4.1.1: alpha amd64 arm hppa ia64 ppc64 ppc s390 sh sparc x86

[Comment 7 Christian Faulhammer (RETIRED) 2008-06-21 09:25:10 UTC]

x86 stable

[Comment 8 Robert Buchholz (RETIRED) 2008-06-21 13:49:55 UTC]

pva, I'm adding release@, or did you handle this yourself already?

[Comment 9 Markus Rothe (RETIRED) 2008-06-21 19:39:10 UTC]

ppc64 stable

[Comment 10 Markus Meier 2008-06-22 11:08:45 UTC]

amd64 stable

[Comment 11 Raúl Porcel (RETIRED) 2008-06-22 18:11:38 UTC]

alpha/ia64/sparc stable

[Comment 12 Jeroen Roovers (RETIRED) 2008-06-23 17:14:05 UTC]

Stable for HPPA.

[Comment 13 Brent Baude (RETIRED) 2008-06-23 19:00:07 UTC]

ppc done

[Comment 14 Robert Buchholz (RETIRED) 2008-06-24 01:05:00 UTC]

GLSA vote, YES for me.

[Comment 15 Tobias Heinlein (RETIRED) 2008-07-02 11:15:08 UTC]

YES too, filing request.

[Comment 16 Chris Gianelloni (RETIRED) 2008-08-01 17:49:17 UTC]

2008.0 is out, so no need to keep release on the CC list.

[Comment 17 Robert Buchholz (RETIRED) 2008-08-06 00:30:47 UTC]

GLSA 200808-02