Palm Pre WebOS version <= 1.1 Floating Point Exception

Credit: PalmPreHacker
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-399

CVSS Base Score: 5.4/10
Impact Subscore: 6.9/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Complete

I. Description The Palm Pre WebOS version <= 1.1 suffers from a floating point exception vulnerability when attempting to view a specially crafted web page. This vulnerability has been addressed in the latest patch from Palm and all users are recommended to update to WebOS version 1.2+. II. Impact If a user views a malicious web page that contains specially crafted data, the "LunaSysMgr" process will crash, causing the device to simulate a reboot. The bug itself is a floating point exception that crashes the "LunaSysMgr" process and forces the device to restart the process, simulating a reboot of the system. At the time of the discovery, the greatest risk to the system was a denial of service condition. The crash does not occur when viewing the malicious web page while in landscape mode. III. Proof of Concept The Palm Pre WebOS version <= 1.1 will crash upon opening a web page that contains 50,280 bytes of data or greater and attempts to refresh the page. Upon viewing the malicious web page the LunaSysMgr process will generate a floating point exception and simulate a system "reboot". The following code will trigger the issue "<meta http-equiv="refresh" content="1">AAAAA..." using 50280 or more characters after the refresh. IV. About This vulnerability was discovered by Townsend Ladd Harris <PalmPreHacker [a t]> Vulnerability details will be posted at: ng.html


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