Your message dated Wed, 16 Dec 2009 23:32:30 +0000
with message-id <[email protected]>
and subject line Bug#522528: fixed in asterisk 1:1.4.21.2~dfsg-3+lenny1
has caused the Debian Bug report #522528,
regarding AST-2009-003: SIP responses expose valid usernames
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact [email protected]
immediately.)
--
522528: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=522528
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: asterisk
version: 1:1.4.21.2~dfsg-3
Severity: grave
Tags: patch
The Asterisk Project has issued the following advisory:
http://downloads.digium.com/pub/asa/AST-2009-003.html
It affects the versions in oldstable (1.2.13), stable/testing/unstable
(1.4.21) and experimental (1.6.1-rc3. rc4, fixing this should be
released shortly).
CVE entry: CVE-2008-3903
I'd like to include here the text of the advisory, as I believe it is
worth restating:
In 2006, the Asterisk maintainers made it more difficult to scan for
valid SIP usernames by implementing an option called
"alwaysauthreject", which should return a 401 error on all replies
which are generated for users which do not exist. While this was
sufficient at the time, due to ever increasing compliance with RFC
3261, the SIP specification, that is no longer sufficient as a means
towards preventing attackers from checking responses to verify whether
a SIP account exists on a machine.
What we have done is to carefully emulate exactly the same responses
throughout possible dialogs, which should prevent attackers from
gleaning this information. All invalid users, if this option is turned
on, will receive the same response throughout the dialog, as if a
username was valid, but the password was incorrect.
It is important to note several things. First, this vulnerability is
derived directly from the SIP specification, and it is a technical
violation of RFC 3261 (and subsequent RFCs, as of this date), for us
to return these responses. Second, this attack is made much more
difficult if administrators avoided creating all-numeric usernames and
especially all-numeric passwords. This combination is extremely
vulnerable for servers connected to the public Internet, even with
this patch in place. While it may make configuring SIP telephones
easier in the short term, it has the potential to cause grief over the
long term.
Patches are linked from the advisory and are now being tested.
--
Tzafrir Cohen
icq#16849755 jabber:[email protected]
+972-50-7952406 mailto:[email protected]
http://www.xorcom.com iax:[email protected]/tzafrir
--- End Message ---
--- Begin Message ---
Source: asterisk
Source-Version: 1:1.4.21.2~dfsg-3+lenny1
We believe that the bug you reported is fixed in the latest version of
asterisk, which is due to be installed in the Debian FTP archive:
asterisk-config_1.4.21.2~dfsg-3+lenny1_all.deb
to main/a/asterisk/asterisk-config_1.4.21.2~dfsg-3+lenny1_all.deb
asterisk-dbg_1.4.21.2~dfsg-3+lenny1_i386.deb
to main/a/asterisk/asterisk-dbg_1.4.21.2~dfsg-3+lenny1_i386.deb
asterisk-dev_1.4.21.2~dfsg-3+lenny1_all.deb
to main/a/asterisk/asterisk-dev_1.4.21.2~dfsg-3+lenny1_all.deb
asterisk-doc_1.4.21.2~dfsg-3+lenny1_all.deb
to main/a/asterisk/asterisk-doc_1.4.21.2~dfsg-3+lenny1_all.deb
asterisk-h323_1.4.21.2~dfsg-3+lenny1_i386.deb
to main/a/asterisk/asterisk-h323_1.4.21.2~dfsg-3+lenny1_i386.deb
asterisk-sounds-main_1.4.21.2~dfsg-3+lenny1_all.deb
to main/a/asterisk/asterisk-sounds-main_1.4.21.2~dfsg-3+lenny1_all.deb
asterisk_1.4.21.2~dfsg-3+lenny1.diff.gz
to main/a/asterisk/asterisk_1.4.21.2~dfsg-3+lenny1.diff.gz
asterisk_1.4.21.2~dfsg-3+lenny1.dsc
to main/a/asterisk/asterisk_1.4.21.2~dfsg-3+lenny1.dsc
asterisk_1.4.21.2~dfsg-3+lenny1_i386.deb
to main/a/asterisk/asterisk_1.4.21.2~dfsg-3+lenny1_i386.deb
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Faidon Liambotis <[email protected]> (supplier of updated asterisk package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Format: 1.8
Date: Mon, 14 Dec 2009 01:11:44 +0200
Source: asterisk
Binary: asterisk asterisk-h323 asterisk-doc asterisk-dev asterisk-dbg
asterisk-sounds-main asterisk-config
Architecture: source all i386
Version: 1:1.4.21.2~dfsg-3+lenny1
Distribution: stable-security
Urgency: high
Maintainer: Debian VoIP Team <[email protected]>
Changed-By: Faidon Liambotis <[email protected]>
Description:
asterisk - Open Source Private Branch Exchange (PBX)
asterisk-config - Configuration files for Asterisk
asterisk-dbg - Debugging symbols for Asterisk
asterisk-dev - Development files for Asterisk
asterisk-doc - Source code documentation for Asterisk
asterisk-h323 - H.323 protocol support for Asterisk
asterisk-sounds-main - Core Sound files for Asterisk (English)
Closes: 522528 554486 554487 559103
Changes:
asterisk (1:1.4.21.2~dfsg-3+lenny1) stable-security; urgency=high
.
* Multiple security fixes:
- "Information leak in IAX2 authentication", AST-2009-001, CVE-2009-0041.
- "Remote Crash Vulnerability in SIP channel driver", AST-2009-002.
- "SIP responses expose valid usernames", AST-2009-003, CVE-2008-3903.
(Closes: #522528)
- "SIP responses expose valid usernames", AST-2009-008, CVE-2009-3727.
(Closes: #554487)
- Stop shipping old static-http code in examples. Among other things, it
includes a vulnerable version of the prototype Javascript library.
AST-2009-009, CVE-2008-7220. (Closes: #554486)
- "RTP Remote Crash Vulnerability", AST-2009-010, CVE-2009-4055.
(Closes: #559103)
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