----------------------------------------------------------------------

A new version (0.9.0.0 - Release Candidate 1) of the free Secunia PSI
has been released. The new version includes many new and advanced
features, which makes it even easier to stay patched.

Download and test it today:
https://psi.secunia.com/

Read more about this new version:
https://psi.secunia.com/?page=changelog

----------------------------------------------------------------------

TITLE:
Cisco Unified IP Phone Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA28935

VERIFY ADVISORY:
http://secunia.com/advisories/28935/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

OPERATING SYSTEM:
Cisco Unified IP Phones 7900 Series
http://secunia.com/product/13543/

SOFTWARE:
Cisco IP Phone 7940
http://secunia.com/product/1113/
Cisco IP Phones 7960
http://secunia.com/product/287/

DESCRIPTION:
Some vulnerabilities have been reported in Cisco Unified IP Phone
models, which can be exploited by malicious users to compromise a
vulnerable device or by malicious people to cause a DoS (Denial of
Service) and compromise a vulnerable device.

1) A boundary error within the internal SSH server can be exploited
to cause a buffer overflow via a specially crafted packet sent to
default port 22/TCP.

2) A boundary error in the parsing of DNS responses can be exploited
to cause a buffer overflow.

3) A boundary error in the handling of MIME encoded data can be
exploited to cause a buffer overflow via a specially crafted SIP
message.

Successful exploitation of the vulnerabilities may allow execution of
arbitrary code.

4) A boundary error within the internal telnet server can be
exploited to cause a buffer overflow via a specially crafted
command.

Successful exploitation may allow execution of arbitrary code but
requires that the telnet server is enabled (not enabled by default).

5) A boundary error in the handling of challenge/response messages
from an SIP proxy can be exploited to cause a  heap-based buffer
overflow.

Successful exploitation may allow execution of arbitrary code but
requires e.g. control of a SIP proxy.

6) An error in the handling of ICMP echo request packets can be
exploited to cause a device to reboot via an overly large ICMP echo
request packet.

7) An error within the internal HTTP server when handling HTTP
requests can be exploited to cause the device to reboot via a
specially crafted HTTP request.

The vulnerabilities affect one or more of the following devices
running SCCP and SIP firmwares (please see the vendor's advisory for
more information):

Cisco Unified IP Phone devices running SCCP firmware:
* 7906G
* 7911G
* 7935
* 7936
* 7940
* 7940G
* 7941G
* 7960
* 7960G
* 7961G
* 7970G
* 7971G

Cisco Unified IP Phone devices running SIP firmware:
* 7940
* 7940G
* 7960
* 7960G

SOLUTION:
Update to the latest firmware versions (see vendor's advisory for
details).

PROVIDED AND/OR DISCOVERED BY:
1) Reported by the vendor
2-5) Jon Griffin and Mustaque Ahamad, School of Computer Science,
Georgia Institute of Technology
6) Reported by a Cisco customer
7) Sven Weizenegger, T-Systems

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20080213-phone.shtml

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------