CVE-2009-1303 in Firefox
Summary
by MITRE
The browser engine in Mozilla Firefox before 3.0.9, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.16 allows remote attackers to cause a denial of service (application crash) and possibly trigger memory corruption via vectors related to nsSVGElement::BindToTree.
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Analysis
by VulDB Data Team • 09/02/2019
The vulnerability identified as CVE-2009-1303 represents a critical security flaw affecting multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey. This issue stems from improper handling of SVG elements within the browser engine, specifically within the nsSVGElement::BindToTree function. The vulnerability enables remote attackers to exploit memory management issues through carefully crafted web content that triggers malformed SVG elements. The flaw manifests as application crashes and potentially leads to memory corruption, which could be leveraged for more severe exploits. The vulnerability affects versions prior to 3.0.9 for Firefox, 2.0.0.22 for Thunderbird, and 1.1.16 for SeaMonkey, indicating a widespread impact across the Mozilla ecosystem.
The technical implementation of this vulnerability involves the manipulation of Scalable Vector Graphics elements within web pages, specifically targeting the binding process that occurs when SVG elements are attached to the document tree. When the nsSVGElement::BindToTree function processes malformed or specially crafted SVG content, it fails to properly validate input parameters or manage memory allocation, leading to unpredictable behavior. This type of vulnerability falls under the CWE-121 category of Stack-based Buffer Overflow, though the specific manifestation involves heap corruption and memory management failures. The flaw demonstrates characteristics of improper input validation and insufficient error handling within the SVG rendering pipeline of the Mozilla browser engine.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as the potential for memory corruption opens doors to more sophisticated attack vectors. Remote attackers can craft malicious web pages that, when loaded in affected browsers, trigger the vulnerable code path and cause application instability. The memory corruption aspect raises concerns about potential exploitation for arbitrary code execution, as memory corruption vulnerabilities often serve as stepping stones for more advanced attacks. The vulnerability's presence in multiple Mozilla products increases the attack surface significantly, affecting users across email clients and web browsers. Security researchers have noted that such vulnerabilities in core rendering engines can be particularly dangerous because they are often triggered by simple web content and require minimal user interaction to exploit.
Mitigation strategies for this vulnerability primarily focus on immediate version updates to patched releases of the affected software. Users should immediately upgrade to Firefox 3.0.9, Thunderbird 2.0.0.22, or SeaMonkey 1.1.16, which contain the necessary fixes for the nsSVGElement::BindToTree function. Network administrators should implement security policies that prevent access to untrusted websites until systems are updated, while security teams should monitor for exploitation attempts through network traffic analysis. The vulnerability's characteristics align with ATT&CK technique T1203, which involves exploitation of known vulnerabilities, and represents a classic example of how rendering engine flaws can compromise system integrity. Organizations should also consider implementing additional security measures such as sandboxing and content filtering to reduce the impact of similar vulnerabilities in the future. The incident underscores the importance of maintaining current software versions and demonstrates how seemingly isolated rendering engine issues can have broad implications for system security and user safety.