![]() ![]() The array object length set as unsigned is then passed to js_GetLenghProperty function for getting the new created array length property. It will call the js3250!array_extra function after setting ArrayExtraMode as 2. If the JavaScript shown above is loaded through the JIT engine by Firefox, the js3250!array_reduceRight function will be executed. This will call reduceRight function on new Array. This code sets the array object length to a long value that will be handled as an unsigned integer. Vulnerability Analysis The following is a sample exploit code: Through this, we were successfully able to execute arbitrary remote code on Firefox 3.6.16. We performed some analysis through reverse engineering and tested with the published proof of concept. Two proofs-of-concept for this vulnerability were already disclosed publicly earlier this month by Matteo Memelli and metasploit. This vulnerability, identified as CVE-2011-2371, lies in the Js3250.dll library and Js3250!array_reduceRight function in Mozilla Firefox, and affects versions earlier than 3.6.18, as well as versions 4.0 through 4.0.1. This Mozilla Firefox vulnerability was discussed by Charis Rohlf and Yan Lvnitskiy during their presentation, Attacking Clientside JIT Compilers at the Black Hat Conference in Las Vegas earlier this year. This is a technical analysis of a recently discovered vulnerability in one of the most-used web browser: Mozilla Firefox. Considering the great amount of time people spend on their computers connected to the Internet, web browsers are prime targets for cybercriminals. To enable Query Parameter Stripping, go into the Firefox Settings, click on Privacy & Security, and then change Enhanced Tracking Protection to Strict.The usage of exploits in current threats underlines the critical need for users to keep programs updated at all times. It does not matter whether you clicked on a link or pasted the URL into the address bar. With the release of Firefox 102, Mozilla has added the new "Query Parameter Stripping" feature that automatically strips some of these query parameters. ![]() ![]() The most well-known example is probably the ?fbclid= parameter that Facebook adds to outbound links. Many companies involved in advertising use custom URL query parameters that enable them to track clicks on links. These applications have had known vulnerabilities, exploited in the wild, so in this release Firefox has blocked these protocols from prompting the user to open them. An attacker who could have convinced a user to drag and drop an image to a filesystem could have manipulated the resulting filename to contain an executable extension.ĬVE-2022-34478: The ms-msdt, search, and search-ms protocols deliver content to Microsoft applications, bypassing the browser when a user accepts a prompt. Drag and drop of malicious image could have led to malicious executable and potential code execution. ModerateĬVE-2022-34482 and CVE-2022-34483: Two separate issues with the same effect. Some of these bugs showed evidence of JavaScript prototype or memory corruption, and with enough effort some of these could have been exploited to run arbitrary code. An iframe that was not permitted to run scripts could do so if the user clicked on a javascript: link.ĬVE-2022-34484: Memory safety bugs fixed in Firefox 102 and Firefox ESR 91.11. Navigations between XML documents may have led to a use-after-free and potentially exploitable crash.ĬVE-2022-34468: CSP sandbox header without 'allow-scripts' can be bypassed via retargeted javascript: URI. If after freeing a memory location, a program does not clear the pointer to that memory, an attacker can use the error to manipulate the program. Use after free (UAF) is a vulnerability caused by incorrect use of dynamic memory during a program's operation. It does not apply to other operating systems.ĬVE-2022-34470: Use-after-free in nsSHistory. These are the CVEs we think you should know: HighĬVE-2022-34479: A malicious website that could create a popup could have resized the popup to overlay the address bar with its own content, resulting in potential user confusion or spoofing attacks. Its goal is to make it easier to share data across separate vulnerability capabilities (tools, databases, and services). Publicly disclosed computer security flaws are listed in the Common Vulnerabilities and Exposures (CVE) database. The new version also comes with a new privacy feature that strips parameters from URLs that track you around the web. The new version fixes 20 security vulnerabilities, five of which are classified as “High”. Mozilla released version 102.0 of the Firefox browser to Release channel users on June 28, 2022. ![]()
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