Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with other browsers. This could have been used to escape HTML comments on pages that put user-controlled data in them. This vulnerability affects Firefox < 101.

The remote host is affected by the vulnerability described in GLSA-202208-08 (Mozilla Firefox: Multiple Vulnerabilities)

  - Use after free in Codecs in Google Chrome prior to 101.0.4951.41 allowed a remote attacker to potentially     exploit heap corruption via a crafted HTML page. (CVE-2022-1919)

  - regex is an implementation of regular expressions for the Rust language. The regex crate features built-in     mitigations to prevent denial of service attacks caused by untrusted regexes, or untrusted input matched     by trusted regexes. Those (tunable) mitigations already provide sane defaults to prevent attacks. This     guarantee is documented and it's considered part of the crate's API. Unfortunately a bug was discovered in     the mitigations designed to prevent untrusted regexes to take an arbitrary amount of time during parsing,     and it's possible to craft regexes that bypass such mitigations. This makes it possible to perform denial     of service attacks by sending specially crafted regexes to services accepting user-controlled, untrusted     regexes. All versions of the regex crate before or equal to 1.5.4 are affected by this issue. The fix is     include starting from regex 1.5.5. All users accepting user-controlled regexes are recommended to upgrade     immediately to the latest version of the regex crate. Unfortunately there is no fixed set of problematic     regexes, as there are practically infinite regexes that could be crafted to exploit this vulnerability.
    Because of this, it us not recommend to deny known problematic regexes. (CVE-2022-24713)

  - Mozilla developers Kershaw Chang, Ryan VanderMeulen, and Randell Jesup reported memory safety bugs present     in Firefox 97. Some of these bugs showed evidence of memory corruption and we presume that with enough     effort some of these could have been exploited to run arbitrary code.  (CVE-2022-0843)

  - After a VR Process is destroyed, a reference to it may have been retained and used, leading to a use-     after-free and potentially exploitable crash.  (CVE-2022-1196)

  - Mozilla: Untrusted input used in JavaScript object indexing, leading to prototype pollution     (CVE-2022-1529)

  - If an attacker was able to corrupt the methods of an Array object in JavaScript via prototype pollution,     they could have achieved execution of attacker-controlled JavaScript code in a privileged context.
    (CVE-2022-1802)

  - If an object prototype was corrupted by an attacker, they would have been able to set undesired attributes     on a JavaScript object, leading to privileged code execution.  (CVE-2022-2200)

  - Mozilla developers and the Mozilla Fuzzing Team reported memory safety bugs present in Thunderbird 102.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code.  (CVE-2022-2505)

  - An attacker could have caused a use-after-free by forcing a text reflow in an SVG object leading to a     potentially exploitable crash.  (CVE-2022-26381)

  - While the text displayed in Autofill tooltips cannot be directly read by JavaScript, the text was rendered     using page fonts. Side-channel attacks on the text by using specially crafted fonts could have lead to     this text being inferred by the webpage.  (CVE-2022-26382)

  - Mozilla: Browser window spoof using fullscreen mode (CVE-2022-26383, CVE-2022-31738)

  - If an attacker could control the contents of an iframe sandboxed with <code>allow-popups</code> but not     <code>allow-scripts</code>, they were able to craft a link that, when clicked, would lead to JavaScript     execution in violation of the sandbox.  (CVE-2022-26384)

  - In unusual circumstances, an individual thread may outlive the thread's manager during shutdown.  This     could have led to a use-after-free causing a potentially exploitable crash.  (CVE-2022-26385)

  - Previously Thunderbird for macOS and Linux would download temporary files to a user-specific directory in     <code>/tmp</code>, but this behavior was changed to download them to <code>/tmp</code> where they could be     affected by other local users.  This behavior was reverted to the original, user-specific directory.  This     bug only affects Thunderbird for macOS and Linux. Other operating systems are unaffected.
    (CVE-2022-26386)

  - When installing an add-on, Thunderbird verified the signature before prompting the user; but while the     user was confirming the prompt, the underlying add-on file could have been modified and Thunderbird would     not have noticed.  (CVE-2022-26387)

  - Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had     reports of attacks in the wild abusing this flaw.  (CVE-2022-26485)

  - An unexpected message in the WebGPU IPC framework could lead to a use-after-free and exploitable sandbox     escape.  We have had reports of attacks in the wild abusing this flaw.  (CVE-2022-26486)

  - If a compromised content process sent an unexpected number of WebAuthN Extensions in a Register command to     the parent process, an out of bounds write would have occurred leading to memory corruption and a     potentially exploitable crash.  (CVE-2022-28281)

  - 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.  (CVE-2022-28282)

  - The sourceMapURL feature in devtools was missing security checks that would have allowed a webpage to     attempt to include local files or other files that should have been inaccessible.  (CVE-2022-28283)

  - SVG's <code><use></code> element could have been used to load unexpected content that could have     executed script in certain circumstances. While the specification seems to allow this, other browsers do     not, and web developers relied on this property for script security so gecko's implementation was aligned     with theirs.  (CVE-2022-28284)

  - When generating the assembly code for <code>MLoadTypedArrayElementHole</code>, an incorrect AliasSet was     used. In conjunction with another vulnerability this could have been used for an out of bounds memory     read.  (CVE-2022-28285)

  - Due to a layout change, iframe contents could have been rendered outside of its border. This could have     led to user confusion or spoofing attacks.  (CVE-2022-28286)

  - In unusual circumstances, selecting text could cause text selection caching to behave incorrectly, leading     to a crash.  (CVE-2022-28287)

  - Mozilla developers and community members Randell Jesup, Sebastian Hengst, and the Mozilla Fuzzing Team     reported memory safety bugs present in Firefox 98. Some of these bugs showed evidence of memory corruption     and we presume that with enough effort some of these could have been exploited to run arbitrary code.
    (CVE-2022-28288)

  - Mozilla developers and community members Nika Layzell, Andrew McCreight, Gabriele Svelto, and the Mozilla     Fuzzing Team reported memory safety bugs present in Thunderbird 91.7. Some of these bugs showed evidence     of memory corruption and we presume that with enough effort some of these could have been exploited to run     arbitrary code.  (CVE-2022-28289)

  - Documents in deeply-nested cross-origin browsing contexts could obtain permissions granted to the top-     level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions.
    (CVE-2022-29909)

  - When closed or sent to the background, Firefox for Android would not properly record and persist HSTS     settings. Note: This issue only affected Firefox for Android. Other operating systems are unaffected.
    (CVE-2022-29910)

  - An improper implementation of the new iframe sandbox keyword <code>allow-top-navigation-by-user-     activation</code> could lead to script execution without <code>allow-scripts</code> being present.
    (CVE-2022-29911)

  - Requests initiated through reader mode did not properly omit cookies with a SameSite attribute.
    (CVE-2022-29912)

  - When reusing existing popups Thunderbird would allow them to cover the fullscreen notification UI, which     could enable browser spoofing attacks.  (CVE-2022-29914)

  - The Performance API did not properly hide the fact whether a request cross-origin resource has observed     redirects.  (CVE-2022-29915)

  - Thunderbird would behave slightly differently for already known resources, when loading CSS resources     through resolving CSS variables. This could be used to probe the browser history.  (CVE-2022-29916)

  - Mozilla developers Gabriele Svelto, Tom Ritter and the Mozilla Fuzzing Team reported memory safety bugs     present in Thunderbird 91.8. Some of these bugs showed evidence of memory corruption and we presume that     with enough effort some of these could have been exploited to run arbitrary code.  (CVE-2022-29917)

  - Mozilla developers Gabriele Svelto, Randell Jesup and the Mozilla Fuzzing Team reported memory safety bugs     present in Firefox 99. Some of these bugs showed evidence of memory corruption and we presume that with     enough effort some of these could have been exploited to run arbitrary code.  (CVE-2022-29918)

  - Mozilla: Cross-Origin resource's length leaked (CVE-2022-31736)

  - A malicious webpage could have caused an out-of-bounds write in WebGL, leading to memory corruption and a     potentially exploitable crash.  (CVE-2022-31737)

  - On arm64, WASM code could have resulted in incorrect assembly generation leading to a register allocation     problem, and a potentially exploitable crash.  (CVE-2022-31740)

  - Mozilla: Uninitialized variable leads to invalid memory read (CVE-2022-31741)

  - Mozilla: Querying a WebAuthn token with a large number of allowCredential entries may have leaked cross-     origin information (CVE-2022-31742)

  - Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with     other browsers. This could have been used to escape HTML comments on pages that put user-controlled data     in them.  (CVE-2022-31743)

  - An attacker could have injected CSS into stylesheets accessible via internal URIs, such as resource:, and     in doing so bypass a page's Content Security Policy.  (CVE-2022-31744)

  - If array shift operations are not used, the Garbage Collector may have become confused about valid     objects.  (CVE-2022-31745)

  - Mozilla developers Andrew McCreight, Nicolas B. Pierron, and the Mozilla Fuzzing Team reported memory     safety bugs present in Firefox 100 and Firefox ESR 91.9. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort some of these could have been exploited to run arbitrary     code.  (CVE-2022-31747)

  - Mozilla developers Gabriele Svelto, Timothy Nikkel, Randell Jesup, Jon Coppeard, and the Mozilla Fuzzing     Team reported memory safety bugs present in Firefox 100. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort some of these could have been exploited to run arbitrary     code.  (CVE-2022-31748)

  - An iframe that was not permitted to run scripts could do so if the user clicked on a     <code>javascript:</code> link.  (CVE-2022-34468)

  - When a TLS Certificate error occurs on a domain protected by the HSTS header, the browser should not allow     the user to bypass the certificate error.  On Firefox for Android, the user was presented with the option     to bypass the error; this could only have been done by the user explicitly.  This bug only affects Firefox     for Android. Other operating systems are unaffected.  (CVE-2022-34469)

  - Navigations between XML documents may have led to a use-after-free and potentially exploitable crash.
    (CVE-2022-34470)

  - When downloading an update for an addon, the downloaded addon update's version was not verified to match     the version selected from the manifest.  If the manifest had been tampered with on the server, an attacker     could trick the browser into downgrading the addon to a prior version.  (CVE-2022-34471)

  - If there was a PAC URL set and the server that hosts the PAC was not reachable, OCSP requests would have     been blocked, resulting in incorrect error pages being shown.  (CVE-2022-34472)

  - The HTML Sanitizer should have sanitized the <code>href</code> attribute of SVG <code><use></code>     tags; however it incorrectly did not sanitize <code>xlink:href</code> attributes.  (CVE-2022-34473)

  - Even when an iframe was sandboxed with <code>allow-top-navigation-by-user-activation</code>, if it     received a redirect header to an external protocol the browser would process the redirect and prompt the     user as appropriate.  (CVE-2022-34474)

  - SVG <code><use></code> tags that referenced a same-origin document could have resulted in script     execution if attacker input was sanitized via the HTML Sanitizer API. This would have required the     attacker to reference a same-origin JavaScript file containing the script to be executed.
    (CVE-2022-34475)

  - ASN.1 parsing of an indefinite SEQUENCE inside an indefinite GROUP could have resulted in the parser     accepting malformed ASN.1.  (CVE-2022-34476)

  - The MediaError message property should be consistent to avoid leaking information about cross-origin     resources; however for a same-site cross-origin resource, the message could have leaked information     enabling XS-Leaks attacks.  (CVE-2022-34477)

  - The <code>ms-msdt</code>, <code>search</code>, and <code>search-ms</code> protocols deliver content to     Microsoft applications, bypassing the browser, when a user accepts a prompt. These applications have had     known vulnerabilities, exploited in the wild (although we know of none exploited through Thunderbird), so     in this release Thunderbird has blocked these protocols from prompting the user to open them. This bug     only affects Thunderbird on Windows. Other operating systems are unaffected.  (CVE-2022-34478)

  - 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.   This bug only affects     Thunderbird for Linux. Other operating systems are unaffected.  (CVE-2022-34479)

  - Within the <code>lginit()</code> function, if several allocations succeed but then one fails, an     uninitialized pointer would have been freed despite never being allocated.  (CVE-2022-34480)

  - In the <code>nsTArrayImpl::ReplaceElementsAt()</code> function, an integer overflow could have occurred     when the number of elements to replace was too large for the container.  (CVE-2022-34481)

  - 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, and by extension potentially     tricked the user into executing malicious code.  While very similar, this is a separate issue from     CVE-2022-34483.  (CVE-2022-34482)

  - 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, and by extension potentially     tricked the user into executing malicious code.  While very similar, this is a separate issue from     CVE-2022-34482.  (CVE-2022-34483)

  - The Mozilla Fuzzing Team reported potential vulnerabilities present in Thunderbird 91.10. Some of these     bugs showed evidence of memory corruption and we presume that with enough effort some of these could have     been exploited to run arbitrary code.  (CVE-2022-34484)

  - Mozilla developers Bryce Seager van Dyk and the Mozilla Fuzzing Team reported potential vulnerabilities     present in Firefox 101. Some of these bugs showed evidence of memory corruption and we presume that with     enough effort some of these could have been exploited to run arbitrary code.  (CVE-2022-34485)

  - When loading a script with Subresource Integrity, attackers with an injection capability could trigger the     reuse of previously cached entries with incorrect, different integrity metadata.  (CVE-2022-36315)

  - When using the Performance API, an attacker was able to notice subtle differences between     PerformanceEntries and thus learn whether the target URL had been subject to a redirect.  (CVE-2022-36316)

  - When visiting directory listings for `chrome://` URLs as source text, some parameters were reflected.
    (CVE-2022-36318)

  - When combining CSS properties for overflow and transform, the mouse cursor could interact with different     coordinates than displayed.  (CVE-2022-36319)

  - Mozilla developers and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 102. Some     of these bugs showed evidence of memory corruption and we presume that with enough effort some of these     could have been exploited to run arbitrary code.  (CVE-2022-36320)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5475-1 advisory.

    Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially     crafted website, an attacker could potentially exploit these to cause a denial of service, obtain     sensitive information, spoof the browser UI, conduct cross-site scripting (XSS) attacks, bypass content     security policy (CSP) restrictions, or execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 101.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2022-20 advisory.

  - A malicious website could have learned the size of a cross-origin resource that supported Range requests.
    (CVE-2022-31736)

  - A malicious webpage could have caused an out-of-bounds write in WebGL, leading to memory corruption and a     potentially exploitable crash. (CVE-2022-31737)

  - When exiting fullscreen mode, an iframe could have confused the browser about the current state of     fullscreen, resulting in potential user confusion or spoofing attacks. (CVE-2022-31738)

  - When downloading files on Windows, the % character was not escaped, which could have lead to a download     incorrectly being saved to attacker-influenced paths that used variables such as %HOMEPATH% or %APPDATA%.
    This bug only affects Firefox for Windows. Other operating systems are unaffected. (CVE-2022-31739)

  - On arm64, WASM code could have resulted in incorrect assembly generation leading to a register allocation     problem, and a potentially exploitable crash. (CVE-2022-31740)

  - A crafted CMS message could have been processed incorrectly, leading to an invalid memory read, and     potentially further memory corruption. (CVE-2022-31741)

  - An attacker could have exploited a timing attack by sending a large number of allowCredential entries and     detecting the difference between invalid key handles and cross-origin key handles.  This could have led to     cross-origin account linking in violation of WebAuthn goals. (CVE-2022-31742)

  - Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with     other browsers. This could have been used to escape HTML comments on pages that put user-controlled data     in them. (CVE-2022-31743)

  - An attacker could have injected CSS into stylesheets accessible via internal URIs, such as resource:, and     in doing so bypass a page's Content Security Policy. (CVE-2022-31744)

  - If array shift operations are not used, the Garbage Collector may have become confused about valid     objects. (CVE-2022-31745)

  - An attacker could have caused an uninitialized variable on the stack to be mistakenly freed, causing a     potentially exploitable crash. (CVE-2022-1919)

  - Mozilla developers Andrew McCreight, Nicolas B. Pierron, and the Mozilla Fuzzing Team reported memory     safety bugs present in Firefox 100 and Firefox ESR 91.9. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort some of these could have been exploited to run arbitrary     code. (CVE-2022-31747)

  - Mozilla developers Gabriele Svelto, Timothy Nikkel, Randell Jesup, Jon Coppeard, and the Mozilla Fuzzing     Team reported memory safety bugs present in Firefox 100. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort some of these could have been exploited to run arbitrary     code. (CVE-2022-31748)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 101.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2022-20 advisory.

  - A malicious website could have learned the size of a cross-origin resource that supported Range requests.
    (CVE-2022-31736)

  - A malicious webpage could have caused an out-of-bounds write in WebGL, leading to memory corruption and a     potentially exploitable crash. (CVE-2022-31737)

  - When exiting fullscreen mode, an iframe could have confused the browser about the current state of     fullscreen, resulting in potential user confusion or spoofing attacks. (CVE-2022-31738)

  - When downloading files on Windows, the % character was not escaped, which could have lead to a download     incorrectly being saved to attacker-influenced paths that used variables such as %HOMEPATH% or %APPDATA%.
    This bug only affects Firefox for Windows. Other operating systems are unaffected. (CVE-2022-31739)

  - On arm64, WASM code could have resulted in incorrect assembly generation leading to a register allocation     problem, and a potentially exploitable crash. (CVE-2022-31740)

  - A crafted CMS message could have been processed incorrectly, leading to an invalid memory read, and     potentially further memory corruption. (CVE-2022-31741)

  - An attacker could have exploited a timing attack by sending a large number of allowCredential entries and     detecting the difference between invalid key handles and cross-origin key handles.  This could have led to     cross-origin account linking in violation of WebAuthn goals. (CVE-2022-31742)

  - Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with     other browsers. This could have been used to escape HTML comments on pages that put user-controlled data     in them. (CVE-2022-31743)

  - An attacker could have injected CSS into stylesheets accessible via internal URIs, such as resource:, and     in doing so bypass a page's Content Security Policy. (CVE-2022-31744)

  - If array shift operations are not used, the Garbage Collector may have become confused about valid     objects. (CVE-2022-31745)

  - An attacker could have caused an uninitialized variable on the stack to be mistakenly freed, causing a     potentially exploitable crash. (CVE-2022-1919)

  - Mozilla developers Andrew McCreight, Nicolas B. Pierron, and the Mozilla Fuzzing Team reported memory     safety bugs present in Firefox 100 and Firefox ESR 91.9. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort some of these could have been exploited to run arbitrary     code. (CVE-2022-31747)

  - Mozilla developers Gabriele Svelto, Timothy Nikkel, Randell Jesup, Jon Coppeard, and the Mozilla Fuzzing     Team reported memory safety bugs present in Firefox 100. Some of these bugs showed evidence of memory     corruption and we presume that with enough effort some of these could have been exploited to run arbitrary     code. (CVE-2022-31748)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
164149	GLSA-202208-08 : Mozilla Firefox: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
162170	Ubuntu 18.04 LTS / 20.04 LTS : Firefox vulnerabilities (USN-5475-1)	Nessus	Ubuntu Local Security Checks	critical
161716	Mozilla Firefox < 101.0	Nessus	Windows	critical
161715	Mozilla Firefox < 101.0	Nessus	MacOS X Local Security Checks	critical

Detections

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CVE-2022-31743

medium

Tenable Plugins

critical

critical

critical

critical