CVE-2009-5098 in Palm Pre WebOS
Summary
by MITRE
The LunaSysMgr process in Palm Pre WebOS 1.1 and earlier, when not viewing web pages in landscape mode, allows remote attackers to cause a denial of service (crash) via a web page containing a long string following a refresh tag, which triggers a floating point exception.
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Analysis
by VulDB Data Team • 10/03/2024
The vulnerability identified as CVE-2009-5098 affects the LunaSysMgr process within Palm Pre WebOS version 1.1 and earlier systems, representing a critical denial of service weakness that can be exploited remotely. This flaw specifically manifests when the device is not displaying web pages in landscape orientation, creating a targeted attack vector that leverages malformed web content to disrupt normal system operations. The vulnerability resides in how the system handles web page rendering and memory management during page refresh operations, making it particularly dangerous in mobile environments where users frequently access web content.
The technical implementation of this vulnerability involves a specific manipulation of web page elements that triggers an unhandled floating point exception within the LunaSysMgr process. When a malicious web page containing an excessively long string following a refresh tag is loaded, the system's memory handling routines fail to properly process the oversized data element, resulting in a critical system crash. This behavior aligns with CWE-129, which addresses improper validation of length in input processing, and represents a classic buffer overflow scenario where input validation fails to account for excessive string lengths. The floating point exception occurs during the parsing of the refresh tag directive, indicating that the system's web rendering engine lacks proper bounds checking for string manipulation operations.
The operational impact of this vulnerability extends beyond simple system disruption, as it creates a persistent threat to device availability and user experience within the Palm Pre ecosystem. Remote attackers can exploit this weakness without requiring physical access or elevated privileges, making it particularly concerning for mobile devices where users expect continuous availability. The vulnerability specifically targets the user interface management process that handles web content display, potentially rendering the device unusable until manual reboot occurs. This type of denial of service attack can be particularly disruptive in environments where device reliability is critical, such as in enterprise settings or for users who depend on mobile connectivity for business operations.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation mechanisms within the web rendering engine and establishing proper bounds checking for all string processing operations. System administrators should prioritize immediate patch deployment for affected WebOS versions, as the vulnerability provides attackers with a straightforward method to cause device crashes. The fix should include enhanced memory management routines that properly handle oversized strings in refresh tags and implement proper exception handling for floating point operations. Organizations should also consider implementing network-level filtering to block potentially malicious web content and establish monitoring procedures to detect unusual crash patterns that may indicate exploitation attempts. This vulnerability demonstrates the importance of input validation in mobile operating systems and aligns with ATT&CK technique T1499.001, which covers network denial of service attacks, emphasizing the need for robust defensive measures in mobile computing environments.