CVE-2015-8664 in Chrome
Summary
by MITRE
Integer overflow in the WebCursor::Deserialize function in content/common/cursors/webcursor.cc in Google Chrome before 47.0.2526.106 allows remote attackers to cause a denial of service or possibly have unspecified other impact via an RGBA pixel array with crafted dimensions, a different vulnerability than CVE-2015-6792.
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Analysis
by VulDB Data Team • 12/20/2024
The vulnerability identified as CVE-2015-8664 represents a critical integer overflow flaw within Google Chrome's web cursor deserialization mechanism. This issue resides in the WebCursor::Deserialize function located at content/common/cursors/webcursor.cc, specifically affecting Chrome versions prior to 47.0.2526.106. The vulnerability stems from inadequate input validation when processing RGBA pixel arrays, creating a scenario where maliciously crafted cursor dimensions can trigger unexpected behavior in the application's memory management systems.
The technical exploitation of this vulnerability occurs when Chrome processes cursor data containing malformed dimensions that exceed the maximum representable value for signed integers. When the deserialization function attempts to calculate memory requirements based on these crafted dimensions, the integer overflow results in a negative or excessively large value being used for memory allocation operations. This flaw falls under the CWE-190 category of integer overflow/underflow, specifically manifesting as an integer overflow during arithmetic operations. The vulnerability demonstrates characteristics consistent with CWE-704, which addresses improper handling of integer overflow conditions that can lead to memory corruption and system instability.
From an operational perspective, this vulnerability presents significant risks to system availability and potentially user safety. Remote attackers can leverage this flaw to induce denial of service conditions by causing Chrome to crash or become unresponsive when processing malicious cursor data. The impact extends beyond simple service disruption as the integer overflow could potentially lead to memory corruption that might enable more sophisticated attacks. According to ATT&CK framework reference T1203, this vulnerability aligns with techniques involving process injection and memory manipulation, while also mapping to T1059 for potential command execution through memory corruption. The vulnerability's exploitation requires minimal user interaction since it can be triggered through web content, making it particularly dangerous in phishing attacks or malicious websites.
The mitigation strategies for CVE-2015-8664 primarily focus on immediate software updates to Chrome versions 47.0.2526.106 and later, which contain patches addressing the integer overflow in cursor deserialization. System administrators should implement comprehensive patch management procedures to ensure all affected systems receive updates promptly. Additionally, network security controls such as web application firewalls and content filtering systems can provide additional layers of protection by blocking suspicious cursor data or malformed web content. Organizations should also consider implementing browser hardening measures including disabling unnecessary browser features and restricting access to potentially malicious websites. The vulnerability highlights the importance of proper input validation and integer overflow protection in security-critical applications, reinforcing the need for adherence to secure coding practices that prevent similar issues in future development cycles.