CVE-2015-0836 in Firefox
Summary
by MITRE
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 36.0, Firefox ESR 31.x before 31.5, and Thunderbird before 31.5 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown vectors.
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Analysis
by VulDB Data Team • 03/10/2022
The vulnerability identified as CVE-2015-0836 represents a critical security flaw within the browser engine of Mozilla Firefox and Thunderbird products across multiple versions. This issue affects Firefox versions prior to 36.0, Firefox ESR 31.x versions before 31.5, and Thunderbird versions before 31.5, indicating a widespread impact across the Mozilla ecosystem. The vulnerability manifests as multiple unspecified flaws that can be exploited remotely, making it particularly dangerous for users who browse the internet or handle email communications through these affected applications.
The technical nature of this vulnerability involves memory corruption within the browser engine's processing mechanisms, which can lead to either denial of service conditions or potentially arbitrary code execution. Memory corruption vulnerabilities typically occur when applications fail to properly manage memory allocation and deallocation, allowing malicious actors to manipulate memory contents in ways that can compromise system integrity. This particular flaw resides in the core rendering and processing components of the browser engine, making it difficult to predict or prevent without proper patching. The unspecified nature of the exact vectors suggests that multiple attack surfaces within the browser engine could be exploited, increasing the complexity and risk associated with this vulnerability.
The operational impact of CVE-2015-0836 extends beyond simple application crashes, as the potential for arbitrary code execution presents a severe threat to system security. Attackers could leverage this vulnerability to gain unauthorized access to affected systems, potentially leading to complete system compromise. The denial of service aspect alone could disrupt business operations by causing applications to crash repeatedly, while the arbitrary code execution capability could enable attackers to install malware, steal sensitive data, or establish persistent backdoors. Organizations relying on these email and web browsing applications face significant risks, particularly in environments where users have access to untrusted websites or receive potentially malicious email attachments.
Security professionals should prioritize immediate patching of affected systems to mitigate the risks associated with this vulnerability. The recommended remediation involves upgrading to Firefox 36.0 or later, Firefox ESR 31.5 or later, and Thunderbird 31.5 or later versions. Additionally, organizations should implement network monitoring to detect potential exploitation attempts and consider deploying application whitelisting policies to prevent execution of untrusted code. The vulnerability aligns with CWE-119, which addresses "Improper Access to Memory" and represents a classic memory corruption flaw that can lead to privilege escalation and system compromise. From an ATT&CK framework perspective, this vulnerability maps to techniques involving privilege escalation and persistence, as attackers could use the arbitrary code execution capability to maintain long-term access to compromised systems. Regular security assessments and vulnerability scanning should be conducted to ensure comprehensive protection against similar threats in the future.