USN-4323-1: Firefox vulnerabilities

Releases

• Ubuntu 19.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• firefox - Mozilla Open Source web browser

Details

Multiple security issues were discovered in Firefox. If a user were
tricked in to opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, or execute arbitrary code. (CVE-2020-6821, CVE-2020-6822,
CVE-2020-6824, CVE-2020-6825, CVE-2020-6826)

It was discovered that extensions could obtain auth codes from OAuth login
flows in some circumstances. If a user were tricked in to installing a
specially crafted extension, an attacker could potentially exploit this to
obtain access to the user's account. (CVE-2020-6823)

Update instructions

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

Ubuntu 19.10

• firefox - 75.0+build3-0ubuntu0.19.10.1

Ubuntu 18.04

• firefox - 75.0+build3-0ubuntu0.18.04.1

Ubuntu 16.04

• firefox - 75.0+build3-0ubuntu0.16.04.1

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

References

• CVE-2020-6821
• CVE-2020-6822
• CVE-2020-6823
• CVE-2020-6824
• CVE-2020-6825
• CVE-2020-6826

Related notices

• USN-4328-1: thunderbird-locale-nn, thunderbird-locale-ko, thunderbird-locale-es, thunderbird-locale-da, thunderbird-locale-pa-in, thunderbird-locale-sv-se, thunderbird-locale-hu, thunderbird-locale-zh-hant, thunderbird-locale-ar, thunderbird-locale-ru, thunderbird-locale-ast, thunderbird-locale-br, thunderbird-locale-zh-hans, thunderbird-locale-pl, thunderbird-locale-ca, thunderbird-locale-en-gb, thunderbird-mozsymbols, thunderbird-locale-sr, thunderbird-locale-uk, thunderbird-locale-si, thunderbird-locale-vi, thunderbird-locale-id, thunderbird-locale-pt-br, thunderbird-locale-es-es, thunderbird-locale-ms, thunderbird-locale-ja, thunderbird-locale-es-ar, thunderbird-locale-he, thunderbird-locale-sv, xul-ext-lightning, thunderbird-locale-fr, thunderbird-locale-nb, thunderbird-locale-cak, thunderbird-locale-zh-tw, thunderbird-locale-uz, thunderbird-locale-sl, thunderbird-locale-bn-bd, thunderbird-locale-hy, thunderbird-locale-et, thunderbird, thunderbird-locale-cy, thunderbird-locale-gd, xul-ext-calendar-timezones, thunderbird-locale-el, thunderbird-locale-lt, thunderbird-locale-pt-pt, thunderbird-locale-ga-ie, thunderbird-locale-bn, thunderbird-locale-eu, thunderbird-locale-ta-lk, thunderbird-locale-kab, thunderbird-locale-cs, thunderbird-locale-dsb, thunderbird-locale-kk, thunderbird-locale-fy, thunderbird-locale-hr, thunderbird-locale-ro, thunderbird-locale-zh-cn, thunderbird-locale-sq, thunderbird-locale-pt, thunderbird-locale-bg, thunderbird-locale-de, thunderbird-locale-fi, thunderbird-locale-ka, thunderbird-locale-en-us, thunderbird-locale-is, thunderbird-locale-mk, thunderbird-locale-gl, thunderbird-gnome-support, thunderbird-locale-ga, xul-ext-gdata-provider, thunderbird-locale-af, thunderbird-locale-tr, thunderbird-locale-nb-no, thunderbird-locale-be, thunderbird-locale-fy-nl, thunderbird-dev, thunderbird-locale-hsb, thunderbird-locale-rm, thunderbird-locale-pa, thunderbird-locale-nl, thunderbird-locale-nn-no, thunderbird-locale-en, thunderbird-locale-ta, thunderbird-locale-sk, thunderbird-locale-it
• USN-4335-1: thunderbird-locale-nn, thunderbird-locale-ko, thunderbird-locale-es, thunderbird-locale-da, thunderbird-locale-pa-in, thunderbird-locale-sv-se, thunderbird-locale-hu, thunderbird-locale-zh-hant, thunderbird-locale-ar, thunderbird-locale-ru, thunderbird-locale-ast, thunderbird-locale-br, thunderbird-locale-zh-hans, thunderbird-locale-pl, thunderbird-locale-ca, thunderbird-locale-en-gb, thunderbird-mozsymbols, thunderbird-locale-sr, thunderbird-locale-uk, thunderbird-locale-si, thunderbird-locale-vi, thunderbird-locale-id, thunderbird-locale-pt-br, thunderbird-locale-es-es, thunderbird-locale-ms, thunderbird-locale-ja, thunderbird-locale-es-ar, thunderbird-locale-he, thunderbird-locale-sv, xul-ext-lightning, thunderbird-locale-fr, thunderbird-locale-nb, thunderbird-locale-cak, thunderbird-locale-zh-tw, thunderbird-locale-uz, thunderbird-locale-sl, thunderbird-locale-bn-bd, thunderbird-locale-hy, thunderbird-locale-et, thunderbird, thunderbird-locale-cy, thunderbird-locale-gd, xul-ext-calendar-timezones, thunderbird-locale-el, thunderbird-locale-lt, thunderbird-locale-pt-pt, thunderbird-locale-ga-ie, thunderbird-locale-bn, thunderbird-locale-eu, thunderbird-locale-ta-lk, thunderbird-locale-kab, thunderbird-locale-cs, thunderbird-locale-dsb, thunderbird-locale-kk, thunderbird-locale-fy, thunderbird-locale-hr, thunderbird-locale-ro, thunderbird-locale-zh-cn, thunderbird-locale-sq, thunderbird-locale-pt, thunderbird-locale-bg, thunderbird-locale-de, thunderbird-locale-fi, thunderbird-locale-ka, thunderbird-locale-en-us, thunderbird-locale-is, thunderbird-locale-mk, thunderbird-locale-gl, thunderbird-gnome-support, thunderbird-locale-ga, xul-ext-gdata-provider, thunderbird-locale-af, thunderbird-locale-tr, thunderbird-locale-nb-no, thunderbird-locale-be, thunderbird-locale-fy-nl, thunderbird-dev, thunderbird-locale-hsb, thunderbird-locale-rm, thunderbird-locale-pa, thunderbird-locale-nl, thunderbird-locale-nn-no, thunderbird-locale-en, thunderbird-locale-ta, thunderbird-locale-sk, thunderbird-locale-it