RIM BlackBerry Pearl 8100 Browser DoS

Credit: Michael Kemp
Risk: Medium
Local: Yes
Remote: No

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

RIM BlackBerry Pearl 8100 Browser DoS ------ 12 March 2007 Summary: A vulnerability has been discovered that could impact upon the availability of the BlackBerry 8100 Wireless handheld (v4.2.0.51). It is possible for a remote attacker to construct a WML page that contains an overly long string value within a link (e.g.: <a href = "aaaaaaaaaaaaaaaaaaa etc.>). Should the page or link be accessed by BlackBerry devices, this leads to a temporary Denial of Service within the 4thPass browser component on the device, and temporary device inoperability. Normal functionality will be returned to the browser / device after an amount of time relative to the size of the link supplied, or by physically removing and reinserting the battery thereby creating a reset. Business Impact: Exploitation of this issue can lead to a loss of device functionality. Affected Product(s): The BlackBerry 8100 (Pearl) handheld device (v4.2.0.51) Remediation: Upgrade to vendor patch 4.2.1 Additional details of this vulnerability are available from the vendor at www.blackberry.com/security/news.jsp Credit: Michael Kemp (www.clappymonkey.com)

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