SIP INVITE vulnerability in From field format string on the BlackBerry 7270 smartphone

Article ID: KB12700

Type:   Security Advisory

First Published:


Last Modified: 09-02-2010


Product(s) Affected:

  • BlackBerry 7200 Series
Collapse Products
ExpandAffected Software
  • BlackBerry® 7270 smartphone
  • BlackBerry® Device Software 4.0 Service Pack 1 Bundle 83 and earlier
CollapseIssue Severity

This vulnerability has a Common Vulnerability Scoring System (CVSS) score of 3.3 (Moderate).


Vulnerabilities exist in the Session Initiation Protocol (SIP) implemented on a BlackBerry 7270 smartphone running BlackBerry Device Software 4.0 Service Pack 1 Bundle 83 and earlier. If these vulnerabilities are exploited by a person with malicious intent, a denial of service may occur in the Phone application, but this will not affect the other capabilities of the BlackBerry 7270 smartphone. This does not affect any other BlackBerry device.

Note: Exploiting these vulnerabilities requires access to a private branch exchange (PBX) from within an enterprise network.


This issue is being tracked by US-CERT as VU#785257.

For more information on SIP vulnerabilities, see KB12705 and KB12707.


The BlackBerry 7270 smartphone user receives a malformed SIP INVITE message. When the BlackBerry smartphone user tries to make a call using the Phone application, the following problems occur:

  • An uncaught exception error message is displayed.
  • When the BlackBerry smartphone user tries to initiate a call, the following error message is displayed:

    Cannot connect. Call in progress

  • The BlackBerry smartphone cannot receive incoming calls. The BlackBerry smartphone does not ring or display any indication of incoming calls.

Note: The BlackBerry smartphone continues to respond to ping requests.


A Denial of Service may occur in the Phone application of the BlackBerry 7270 smartphone.

A malformed SIP INVITE message with a large number of format string parameters in the From field of the message and a source IP address spoofed as the IP address of the SIP INVITE message is sent to the BlackBerry 7270 smartphone. This is designed to overload the function stack frame. As a result, format string vulnerabilities may prevent the BlackBerry smartphone user from making a call using the Phone application on the BlackBerry 7270 smartphone.


Upgrade to BlackBerry Device Software 4.0 Service Pack 1 Bundle 108 or later.


Reset the Phone application by performing a hard reset of the BlackBerry smartphone. For instructions, see KB02141.

CollapseAdditional Information


CVSS is a vendor agnostic, industry open standard designed to convey the severity of vulnerabilities. CVSS scores may be used to determine the urgency for update deployment within an organization. CVSS scores range from 0.0 (no vulnerability) to 10.0 (critical). RIM uses CVSS in vulnerability assessments to present an immutable characterization of security issues. RIM assigns all security relevant issues a non-zero score.

BlackBerry Security

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This vulnerability was discovered by Sipera VIPER Lab, which assisted Research In Motion (RIM) in identifying the cause of the issue.
CollapseChange Log


Updates to article formatting. No technical content changed.


Update due to a system upgrade that did not affect article content.


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