CVE-2024-7255 in Chrome
Summary
by MITRE • 08/01/2024
Out of bounds read in WebTransport in Google Chrome prior to 127.0.6533.88 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 03/16/2025
The vulnerability identified as CVE-2024-7255 represents a critical out of bounds read condition within the WebTransport implementation of Google Chrome browsers. This flaw exists in versions prior to 127.0.6533.88 and constitutes a high severity issue according to Chromium security classifications. The vulnerability specifically affects the WebTransport API which enables bidirectional communication between web applications and servers using QUIC protocol. An attacker can exploit this weakness by crafting a malicious HTML page that triggers the out of bounds memory access during normal browser operation.
The technical nature of this vulnerability stems from improper bounds checking within the WebTransport component's memory management routines. When processing certain WebTransport requests or responses, the code fails to validate array indices or buffer boundaries before accessing memory locations. This allows an attacker to manipulate input data in a way that causes the application to read memory beyond its allocated boundaries. Such out of bounds reads can potentially expose sensitive information from adjacent memory locations, including cryptographic keys, session tokens, or other confidential data stored in the browser's memory space. The vulnerability operates at the application level within the browser's rendering engine, making it particularly dangerous as it can be triggered through standard web browsing activities.
The operational impact of CVE-2024-7255 extends beyond simple information disclosure, as it provides potential attack vectors for more sophisticated exploits. Remote attackers can leverage this vulnerability to conduct reconnaissance activities by reading memory contents that may contain sensitive information. The out of bounds read could potentially be chained with other vulnerabilities to achieve arbitrary code execution or privilege escalation within the browser sandbox. This makes the vulnerability particularly concerning for users who frequently browse untrusted websites or engage in online activities that involve sensitive data handling. The risk is amplified because the attack requires no user interaction beyond visiting a malicious webpage, making it a significant threat to browser security.
Mitigation strategies for this vulnerability primarily involve updating to the patched version of Google Chrome 127.0.6533.88 or later, which includes proper bounds checking mechanisms. Organizations should prioritize immediate deployment of this security update across all affected systems. Additionally, implementing network-level protections such as web application firewalls and content filtering solutions can provide additional defense in depth. Browser hardening measures including disabling unnecessary WebTransport features for users who do not require them can reduce the attack surface. Security teams should monitor for exploitation attempts and implement proper logging to detect potential abuse of this vulnerability. The vulnerability aligns with CWE-129, which addresses improper validation of array indices, and may map to ATT&CK technique T1059.001 for remote code execution through web-based attacks. Regular security assessments and penetration testing should be conducted to ensure comprehensive protection against similar memory corruption vulnerabilities.