CVE-2007-0127 in Web Browser
Summary
by MITRE
The Javascript SVG support in Opera before 9.10 does not properly validate object types in a createSVGTransformFromMatrix request, which allows remote attackers to execute arbitrary code via JavaScript code that uses an invalid object in this request that causes a controlled pointer to be referenced during the virtual function call.
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Analysis
by VulDB Data Team • 10/03/2017
The vulnerability identified as CVE-2007-0127 represents a critical heap-based buffer overflow in Opera web browser versions prior to 9.10, specifically within the JavaScript SVG support implementation. This flaw resides in the browser's handling of createSVGTransformFromMatrix requests, where insufficient validation of object types creates a pathway for malicious code execution. The vulnerability manifests when JavaScript code attempts to pass an invalid object to the createSVGTransformFromMatrix function, which then triggers an improper pointer dereference during virtual function calls. This particular issue falls under the CWE-121 heap-based buffer overflow category, where the improper handling of object references leads to memory corruption that can be exploited by remote attackers.
The technical exploitation of this vulnerability relies on the browser's JavaScript engine failing to properly validate the type of objects passed to SVG transformation functions. When an attacker crafts malicious JavaScript code that supplies an invalid object to createSVGTransformFromMatrix, the browser's internal processing mechanism attempts to dereference a controlled pointer during virtual function invocation. This pointer manipulation creates a condition where arbitrary code can be executed with the privileges of the user running the browser. The vulnerability demonstrates characteristics consistent with CWE-787 out-of-bounds write conditions and CWE-119 improper restriction of operations within a limited memory buffer, where the lack of proper type checking allows attackers to manipulate memory layout and execute malicious payloads.
Operationally, this vulnerability presents a significant risk to users of older Opera versions as it enables remote code execution without requiring any user interaction beyond visiting a malicious website. The attack vector operates entirely through web-based JavaScript execution, making it particularly dangerous in phishing campaigns and drive-by download scenarios. Attackers can leverage this vulnerability to install malware, steal sensitive information, or compromise the entire system. The exploitability is enhanced by the fact that it requires no special privileges or user actions beyond browsing to compromised sites, making it a preferred target for automated attack frameworks. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under T1059.007 command and scripting interpreter JavaScript and T1068 legitimate credentials for privilege escalation.
Mitigation strategies for CVE-2007-0127 require immediate browser updates to Opera 9.10 or later versions where the vulnerability has been patched. System administrators should implement network-based protections such as web application firewalls that can detect and block malicious JavaScript patterns targeting SVG functionality. Additionally, users should be educated about the risks of visiting untrusted websites and the importance of keeping browsers updated. The patch for this vulnerability specifically addresses the object type validation issue by implementing proper type checking before processing createSVGTransformFromMatrix requests. Organizations should also consider implementing browser hardening measures such as disabling JavaScript for untrusted sites, using sandboxing technologies, and maintaining comprehensive monitoring for suspicious JavaScript execution patterns that could indicate exploitation attempts.