CVE-2014-7927 in Chrome
Summary
by MITRE
The SimplifiedLowering::DoLoadBuffer function in compiler/simplified-lowering.cc in Google V8, as used in Google Chrome before 40.0.2214.91, does not properly choose an integer data type, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via crafted JavaScript code.
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Analysis
by VulDB Data Team • 03/06/2022
The vulnerability identified as CVE-2014-7927 resides within Google V8's JavaScript engine compiler component, specifically in the SimplifiedLowering::DoLoadBuffer function located in compiler/simplified-lowering.cc. This flaw represents a critical type handling issue that affects Google Chrome versions prior to 40.0.2214.91, making it a significant concern for web browser security. The vulnerability stems from improper integer data type selection during JavaScript compilation, which creates opportunities for malicious code execution through carefully crafted JavaScript payloads. This issue falls under the broader category of memory corruption vulnerabilities that can lead to system instability and potential exploitation.
The technical flaw manifests when the SimplifiedLowering::DoLoadBuffer function fails to correctly determine and select appropriate integer data types during the compilation process of JavaScript code. This improper type selection occurs within V8's compilation pipeline where JavaScript operations are translated into machine code. When attackers submit malicious JavaScript code that triggers this specific code path, the compiler's incorrect type handling can result in memory corruption patterns that manifest as denial of service conditions. The vulnerability's impact extends beyond simple service disruption, as the memory corruption can potentially enable more sophisticated attacks depending on the execution context and system configuration.
From an operational standpoint, this vulnerability presents a serious risk to web browser users and organizations relying on affected Chrome versions. The remote exploitation capability means that attackers can trigger the vulnerability through web pages without requiring user interaction beyond visiting malicious sites. This makes it particularly dangerous in phishing campaigns or compromised websites where users might inadvertently encounter the malicious JavaScript code. The potential for unspecified other impacts suggests that while denial of service is the primary concern, there may also be opportunities for information disclosure or privilege escalation depending on the specific attack scenario and target system configuration.
The vulnerability aligns with CWE-129, which covers improper validation of array indices, and relates to the broader ATT&CK technique of execution through web browsers. Organizations should prioritize immediate patching of affected Chrome versions to prevent exploitation, as the vulnerability exists within the core JavaScript engine that processes all web content. Security teams should also implement network-based protections such as web application firewalls and content filtering systems to detect and block known malicious JavaScript patterns. Additionally, browser hardening measures including sandboxing and strict content security policies can provide additional defense layers against exploitation attempts. The remediation process requires updating to Chrome version 40.0.2214.91 or later, which includes the necessary compiler fixes to properly handle integer data type selection and prevent the memory corruption patterns associated with this vulnerability.