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USN-6509-1: Firefox vulnerabilities

23 November 2023

Several security issues were fixed in Firefox.

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Releases

Packages

  • firefox - Mozilla Open Source web browser

Details

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 across domains, or execute arbitrary code. (CVE-2023-6206,
CVE-2023-6210, CVE-2023-6211, CVE-2023-6212, CVE-2023-6213)

It was discovered that Firefox did not properly manage memory when
images were created on the canvas element. An attacker could potentially
exploit this issue to obtain sensitive information. (CVE-2023-6204)

It discovered that Firefox incorrectly handled certain memory when using a
MessagePort. An attacker could potentially exploit this issue to cause a
denial of service. (CVE-2023-6205)

It discovered that Firefox incorrectly did not properly manage ownership
in ReadableByteStreams. An attacker could potentially exploit this issue
to cause a denial of service. (CVE-2023-6207)

It discovered that Firefox incorrectly did not properly manage copy
operations when using Selection API in X11. An attacker could potentially
exploit this issue to obtain sensitive information. (CVE-2023-6208)

Rachmat Abdul Rokhim discovered that Firefox incorrectly handled parsing
of relative URLS starting with "///". An attacker could potentially
exploit this issue to cause a denial of service. (CVE-2023-6209)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04

After a standard system update you need to restart Firefox to make all the
necessary changes.

Related notices

  • USN-6515-1: thunderbird-locale-nb, thunderbird-dev, thunderbird-locale-lt, thunderbird-locale-pt, thunderbird-locale-fy, thunderbird-gnome-support, thunderbird-locale-gl, thunderbird-locale-ast, thunderbird-locale-cak, thunderbird-locale-mk, thunderbird-locale-ms, thunderbird-locale-et, thunderbird-locale-ga-ie, thunderbird-locale-sv-se, thunderbird-locale-ja, thunderbird-locale-zh-hant, thunderbird-locale-nb-no, thunderbird-locale-pt-br, thunderbird-locale-pa, thunderbird-locale-de, thunderbird-locale-be, thunderbird-locale-zh-hans, thunderbird-locale-ca, thunderbird-locale-en-gb, thunderbird-locale-pl, thunderbird-locale-ru, thunderbird-locale-es-ar, xul-ext-lightning, thunderbird-locale-th, xul-ext-gdata-provider, thunderbird-locale-sk, thunderbird-locale-cy, thunderbird-locale-hu, thunderbird-locale-el, thunderbird-locale-rm, thunderbird-locale-eu, thunderbird-locale-ta-lk, thunderbird-locale-lv, thunderbird-locale-pa-in, thunderbird-locale-he, thunderbird-locale-ko, thunderbird-locale-fy-nl, thunderbird-locale-en-us, xul-ext-calendar-timezones, thunderbird-locale-br, thunderbird-locale-tr, thunderbird-locale-af, thunderbird-locale-nn-no, thunderbird-locale-uz, thunderbird-locale-id, thunderbird-locale-kk, thunderbird-locale-fa, thunderbird-locale-uk, thunderbird-locale-hsb, thunderbird-locale-pt-pt, thunderbird-locale-sv, thunderbird-locale-ro, thunderbird-locale-da, thunderbird-locale-sl, thunderbird-locale-si, thunderbird-locale-es-es, thunderbird-locale-kab, thunderbird-locale-hr, thunderbird-locale-nl, thunderbird-locale-cs, thunderbird, thunderbird-mozsymbols, thunderbird-locale-vi, thunderbird-locale-zh-cn, thunderbird-locale-is, thunderbird-locale-ta, thunderbird-locale-nn, thunderbird-locale-bn-bd, thunderbird-locale-zh-tw, thunderbird-locale-fr, thunderbird-locale-ka, thunderbird-locale-dsb, thunderbird-locale-ar, thunderbird-locale-hy, thunderbird-locale-en, thunderbird-locale-sq, thunderbird-locale-es, thunderbird-locale-sr, thunderbird-locale-it, thunderbird-locale-gd, thunderbird-locale-bn, thunderbird-locale-ga, thunderbird-locale-fi, thunderbird-locale-bg