CVE-2018-18501 in Firefox
Summary
by MITRE
Mozilla developers and community members reported memory safety bugs present in Firefox 64 and Firefox ESR 60.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.
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Analysis
by VulDB Data Team • 05/08/2020
This vulnerability represents a collection of memory safety issues discovered in Mozilla's browser and email client software, specifically affecting versions prior to the mentioned security releases. The reported bugs stem from fundamental flaws in how the applications handle memory allocation and deallocation processes, creating potential entry points for malicious actors seeking to exploit these weaknesses. The presence of memory corruption evidence indicates that these vulnerabilities could allow attackers to manipulate program memory in ways that compromise system integrity. The affected products include Firefox versions before 65, Firefox ESR versions before 60.5, and Thunderbird versions before 60.5, demonstrating the widespread nature of this memory safety concern across Mozilla's product ecosystem. These vulnerabilities fall under the category of memory safety issues that are particularly dangerous because they can lead to arbitrary code execution when successfully exploited.
The technical flaw manifests through memory safety bugs that can cause unpredictable behavior when the applications process certain inputs or perform specific operations. When memory corruption occurs, it typically happens due to improper handling of buffer overflows, use-after-free conditions, or other memory management errors that violate standard programming practices. These memory safety issues are particularly concerning because they can be leveraged by attackers to gain control over the execution flow of the applications. The bugs likely involve scenarios where the software does not properly validate input data or does not correctly manage memory pointers, allowing malicious input to overwrite critical memory locations. The potential for arbitrary code execution emerges when an attacker can manipulate memory in such a way that they can inject and execute malicious code within the context of the vulnerable application. This type of vulnerability aligns with common attack patterns found in the attack mitigation frameworks, where memory corruption issues represent one of the most frequently exploited classes of vulnerabilities in web browsers and email clients.
The operational impact of these vulnerabilities extends beyond simple functionality degradation to potentially enable complete system compromise when exploited. Organizations using affected versions of Mozilla products face significant risk as these vulnerabilities can be exploited remotely without user interaction, making them particularly dangerous in enterprise environments. The memory corruption issues could allow attackers to escalate privileges, steal sensitive data, or establish persistent access to compromised systems. The fact that multiple products within the Mozilla suite are affected suggests that attackers could target different applications within the same organization, increasing the overall attack surface. Security teams must consider these vulnerabilities as critical threats requiring immediate remediation, as the potential for exploitation exists even in environments with basic security controls in place. The vulnerabilities also highlight the importance of keeping software updated, as the fixes for these memory safety issues were implemented in the subsequent releases.
Mitigation strategies for this vulnerability should prioritize immediate patching of all affected software versions to prevent exploitation attempts. Organizations should implement network monitoring to detect potential exploitation attempts targeting these memory safety issues, as attackers may attempt to leverage these vulnerabilities in targeted campaigns. The remediation process should include comprehensive testing of patched versions to ensure that the memory safety issues have been properly addressed without introducing new problems. Security teams should also consider implementing additional protective measures such as application whitelisting, sandboxing techniques, and strict input validation processes to reduce the risk of exploitation. The vulnerability serves as a reminder of the importance of maintaining up-to-date security patches and the need for continuous monitoring of software vulnerabilities, particularly in widely used applications like web browsers and email clients. Organizations should also review their incident response procedures to ensure they can effectively respond to potential exploitation attempts targeting these types of memory safety vulnerabilities, which align with common attack patterns documented in security frameworks and threat intelligence reports.