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AUSCERT External Security Bulletin Redistribution
ESB-2011.0273
STARTTLS plaintext command injection vulnerability
9 March 2011
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AusCERT Security Bulletin Summary
---------------------------------
Product: STARTTLS
Publisher: US-CERT
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2011-0411
Original Bulletin:
http://www.kb.cert.org/vuls/id/555316
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Vulnerability Note VU#555316
STARTTLS plaintext command injection vulnerability
Overview
Some STARTTLS implementations could allow a remote attacker to inject commands
during the plaintext phase of the protocol.
I. Description
STARTTLS is an extension to plaintext communication protocols that offers a
way to upgrade a plaintext connection to an encrypted (TLS or SSL) connection
instead of using a separate port for encrypted communication. Some
implementations of STARTTLS contain a vulnerability that could allow a remote
unauthenticated attacker to inject commands during the plaintext protocol
phase, that will be executed during the ciphertext protocol phase. This
vulnerability is caused by the switch from plaintext to TLS being implemented
below the application's I/O buffering layer.
This issue is only of practical concern for affected implementations that also
perform correct certificate validation. Implementations which do not perform
certificate validation are already inherently vulnerable to man-in-the-middle
attacks.
Note: Not all implementations of STARTTLS are affected by this vulnerability.
Please see the Vendor Information below for specific vendor information.
II. Impact
A remote attacker with the ability to pose as a man-in-the-middle may be able
to inject commands for the corresponding protocol (e.g., SMTP, POP3, etc.)
during the plaintext protocol phase, that will then be executed during the
ciphertext protocol phase.
III. Solution
Update
Please see the Vendor Information below for specific vendor information and
patches.
Purge the application I/O buffer
Developers of STARTTLS-enabled applications should take care to purge the
application's I/O buffer immediately after switching to TLS in order to
mitigate this vulnerability.
Vendor Information
Vendor Status Date Notified Date Updated
3com Inc Unknown 2011-01-19 2011-01-19
ACCESS Unknown 2011-01-19 2011-01-19
Alcatel-Lucent Unknown 2011-01-19 2011-01-19
America Online Inc. Unknown 2011-01-19 2011-01-19
Apache HTTP Server Project Unknown 2011-01-19 2011-01-19
AT&T Unknown 2011-01-19 2011-01-19
Avaya, Inc. Unknown 2011-01-19 2011-01-19
Barracuda Networks Unknown 2011-01-19 2011-01-19
Belkin, Inc. Unknown 2011-01-19 2011-01-19
Blue Coat Systems Unknown 2011-01-19 2011-01-19
Borderware Technologies Unknown 2011-01-19 2011-01-19
Check Point Software Technologies Unknown 2011-01-19 2011-01-19
Cisco Systems, Inc. Unknown 2011-01-19 2011-01-19
Clavister Unknown 2011-01-19 2011-01-19
Computer Associates Unknown 2011-01-19 2011-01-19
Courier-mta Unknown 2011-01-27 2011-01-27
Cray Inc. Unknown 2011-01-19 2011-01-19
EMC Corporation Unknown 2011-01-19 2011-01-19
Engarde Secure Linux Unknown 2011-01-19 2011-01-19
Enterasys Networks Unknown 2011-01-19 2011-01-19
Ericsson Unknown 2011-01-19 2011-01-19
eSoft, Inc. Unknown 2011-01-19 2011-01-19
Extreme Networks Unknown 2011-01-19 2011-01-19
F5 Networks, Inc. Unknown 2011-01-19 2011-01-19
Force10 Networks, Inc. Unknown 2011-01-19 2011-01-19
Fortinet, Inc. Unknown 2011-01-19 2011-01-19
Foundry Networks, Inc. Unknown 2011-01-19 2011-01-19
Fujitsu Unknown 2011-01-19 2011-01-19
Global Technology Associates, Inc. Unknown 2011-01-19 2011-01-19
Google Unknown 2011-01-19 2011-01-19
Hewlett-Packard Company Unknown 2011-01-19 2011-01-19
Hitachi Unknown 2011-01-19 2011-01-19
IBM Corporation Unknown 2011-01-19 2011-01-19
IBM Corporation (zseries) Unknown 2011-01-19 2011-01-19
IBM eServer Unknown 2011-01-19 2011-01-19
Infoblox Unknown 2011-01-19 2011-01-19
Intel Corporation Unknown 2011-01-19 2011-01-19
Internet Security Systems, Inc. Unknown 2011-01-19 2011-01-19
Intoto Unknown 2011-01-19 2011-01-19
IP Infusion, Inc. Unknown 2011-01-19 2011-01-19
Ipswitch, Inc Affected 2011-01-21 2011-03-01
Juniper Networks, Inc. Unknown 2011-01-19 2011-01-19
Kerio Technologies Affected 2011-01-19 2011-03-01
M86 Security Unknown 2011-01-19 2011-01-19
McAfee Unknown 2011-01-19 2011-01-19
MontaVista Software, Inc. Unknown 2011-01-19 2011-01-19
NEC Corporation Unknown 2011-01-19 2011-01-19
NetApp Unknown 2011-01-19 2011-01-19
Nokia Unknown 2011-01-19 2011-01-19
Nortel Networks, Inc. Unknown 2011-01-19 2011-01-19
Novell, Inc. Not Affected 2011-01-19 2011-03-03
Oracle Corporation Unknown 2011-01-19 2011-01-19
Palo Alto Networks Not Affected 2011-01-19 2011-03-01
Postfix Affected 2011-03-03
Process Software Unknown 2011-01-19 2011-01-19
Q1 Labs Unknown 2011-01-19 2011-01-19
Qmail-TLS Affected 2011-01-19 2011-03-07
QNX Software Systems Inc. Unknown 2011-01-19 2011-01-19
RadWare, Inc. Unknown 2011-01-19 2011-01-19
Red Hat, Inc. Unknown 2011-01-19 2011-01-19
Redback Networks, Inc. Unknown 2011-01-19 2011-01-19
SafeNet Unknown 2011-01-19 2011-01-19
Secureworx, Inc. Unknown 2011-01-19 2011-01-19
Silicon Graphics, Inc. Unknown 2011-01-19 2011-01-19
Sony Corporation Unknown 2011-01-19 2011-01-19
Stonesoft Unknown 2011-01-19 2011-01-19
Sun Microsystems, Inc. Affected 2011-01-19 2011-03-01
Symantec Unknown 2011-01-19 2011-01-19
The SCO Group Affected 2011-01-19 2011-03-01
Unisys Unknown 2011-01-19 2011-01-19
Vyatta Unknown 2011-01-19 2011-01-19
Watchguard Technologies, Inc. Unknown 2011-01-19 2011-01-19
Wind River Systems, Inc. Unknown 2011-01-19 2011-01-19
ZyXEL Unknown 2011-01-19 2011-01-19
References
http://tools.ietf.org/html/rfc2595
http://tools.ietf.org/html/rfc3207
http://tools.ietf.org/html/rfc4642
Credit
Thanks to Wietse Venema for reporting this vulnerability.
This document was written by Michael Orlando.
Other Information
Date Public: 2011-03-07
Date First Published: 2011-03-07
Date Last Updated: 2011-03-07
CERT Advisory:
CVE-ID(s): CVE-2011-0411
NVD-ID(s): CVE-2011-0411
US-CERT Technical Alerts:
Severity Metric: 1.39
Document Revision: 31
If you have feedback, comments, or additional information about this
vulnerability, please send us email.
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