CVE-2022-28282 in Thunderbird
Summary
by MITRE • 12/22/2022
By using a link with <code>rel="localization"</code> a use-after-free could have been triggered by destroying an object during JavaScript execution and then referencing the object through a freed pointer, leading to a potential exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.
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Analysis
by VulDB Data Team • 04/29/2025
The vulnerability identified as CVE-2022-28282 represents a critical use-after-free condition that emerged within Mozilla's browser and email client software ecosystems. This flaw specifically manifests when processing HTML elements containing the rel="localization" attribute, creating a scenario where object memory management becomes compromised during JavaScript execution cycles. The vulnerability operates through a sophisticated memory corruption mechanism that exploits the timing of object destruction and subsequent pointer references, fundamentally undermining the application's memory safety guarantees. The affected software versions include Thunderbird versions prior to 91.8, Firefox versions before 99, and Firefox ESR versions before 91.8, indicating this issue spans multiple product lines within the Mozilla suite.
The technical implementation of this vulnerability resides in the browser's handling of localization resources and their associated memory management. When a webpage contains HTML elements with the rel="localization" attribute, the browser's rendering engine processes these elements through a complex chain of operations involving resource loading, object instantiation, and JavaScript execution. During this process, an object becomes prematurely destroyed while JavaScript code is still actively executing, leaving behind a dangling pointer that can later be dereferenced. This specific memory management flaw creates an exploitable condition where attackers can manipulate the execution flow by controlling the memory layout and potentially executing arbitrary code. The vulnerability maps directly to CWE-416, which describes the use of freed memory condition, and represents a classic example of how improper object lifecycle management can lead to security breaches.
The operational impact of this vulnerability extends beyond simple application crashes, presenting significant risks to user security and system integrity. An attacker could potentially leverage this use-after-free condition to execute remote code on affected systems, particularly when users navigate to malicious websites or open compromised email messages containing the vulnerable HTML constructs. The exploitation potential is heightened because the vulnerability occurs during normal browsing operations, making it difficult to detect and prevent through standard security measures. This type of vulnerability aligns with ATT&CK technique T1059.007, which covers JavaScript-based attacks, and represents a critical threat vector for privilege escalation and persistent access. The widespread nature of the affected software versions means that a significant user base remains vulnerable, particularly in enterprise environments where older software versions are commonly deployed.
Mitigation strategies for CVE-2022-28282 require immediate software updates to the patched versions of affected browsers and email clients. Organizations should prioritize patching all systems running vulnerable versions of Firefox, Thunderbird, or Firefox ESR to prevent exploitation. Security administrators should implement network monitoring to detect potential exploitation attempts and consider deploying browser security extensions that can help prevent the execution of malicious JavaScript code. The vulnerability also underscores the importance of maintaining up-to-date security practices and regular vulnerability assessments, particularly for software that handles complex HTML and JavaScript processing. Additionally, users should be educated about the risks of visiting untrusted websites and opening suspicious email attachments, as these remain the primary attack vectors for exploiting such memory corruption vulnerabilities.