Posted: Wed Oct 10, 2007 5:02 pm Post subject: [asterisk-announce] AST-2007-022: Buffer overflows in voicem
Asterisk Project Security Advisory - AST-2007-022
+------------------------------------------------------------------------+
| Product | Asterisk |
|--------------------+---------------------------------------------------|
| Summary | Buffer overflows in voicemail when using IMAP |
| | storage |
|--------------------+---------------------------------------------------|
| Nature of Advisory | Remotely and locally exploitable buffer overflows |
|--------------------+---------------------------------------------------|
| Susceptibility | Remote Unauthenticated Sessions |
|--------------------+---------------------------------------------------|
| Severity | Minor |
|--------------------+---------------------------------------------------|
| Exploits Known | No |
|--------------------+---------------------------------------------------|
| Reported On | October 9, 2007 |
|--------------------+---------------------------------------------------|
| Reported By | Russell Bryant <russell@digium.com> |
| | |
| | Mark Michelson <mmichelson@digium.com> |
|--------------------+---------------------------------------------------|
| Posted On | October 9, 2007 |
|--------------------+---------------------------------------------------|
| Last Updated On | October 10, 2007 |
|--------------------+---------------------------------------------------|
| Advisory Contact | Mark Michelson <mmichelson@digium.com> |
|--------------------+---------------------------------------------------|
| CVE Name | |
+------------------------------------------------------------------------+
+------------------------------------------------------------------------+
| Description | The function "sprintf" was used heavily throughout the |
| | IMAP-specific voicemail code. After auditing the code, |
| | two vulnerabilities were discovered, both buffer |
| | overflows. |
| | |
| | The following buffer overflow required write access to |
| | Asterisk's configuration files in order to be exploited. |
| | |
| | 1) If a combination of the astspooldir (set in |
| | asterisk.conf), the voicemail context, and voicemail |
| | mailbox, were very long, then there was a buffer |
| | overflow when playing a message or forwarding a message |
| | (in the case of forwarding, the context and mailbox in |
| | question are the context and mailbox that the message |
| | was being forwarded to). |
| | |
| | The following buffer overflow could be exploited |
| | remotely. |
| | |
| | 2) If any one of, or any combination of the Content-type |
| | or Content-description headers for an e-mail that |
| | Asterisk recognized as a voicemail message contained |
| | more than a 1024 characters, then a buffer would |
| | overflow while listening to a voicemail message via a |
| | telephone. It is important to note that this did NOT |
| | affect users who get their voicemail via an e-mail |
| | client. |
+------------------------------------------------------------------------+
+------------------------------------------------------------------------+
| Resolution | "sprintf" calls have been changed to "snprintf" wherever |
| | space was not specifically allocated to the buffer prior |
| | to the sprintf call. This includes places which are not |
| | currently prone to buffer overflows. |
+------------------------------------------------------------------------+
+------------------------------------------------------------------------+
| Revision History |
|------------------------------------------------------------------------|
| Date | Editor | Revisions Made |
|--------------------+---------------------------+-----------------------|
| October 9, 2007 | mmichelson@digium.com | Initial Release |
+------------------------------------------------------------------------+
Asterisk Project Security Advisory - AST-2007-022
Copyright (c) 2007 Digium, Inc. All Rights Reserved.
Permission is hereby granted to distribute and publish this advisory in its
original, unaltered form.
_______________________________________________
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