USN-4637-1: Firefox vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 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 across origins, bypass security restrictions, conduct phishing
attacks, conduct cross-site scripting (XSS) attacks, bypass Content
Security Policy (CSP) restrictions, conduct DNS rebinding attacks, or
execute arbitrary code.

Update instructions

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

Ubuntu 20.10

• firefox - 83.0+build2-0ubuntu0.20.10.1

Ubuntu 20.04

• firefox - 83.0+build2-0ubuntu0.20.04.1

Ubuntu 18.04

• firefox - 83.0+build2-0ubuntu0.18.04.2

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

References

• CVE-2020-26952
• CVE-2020-26959
• CVE-2020-26969
• CVE-2020-26960
• CVE-2020-26961
• CVE-2020-26958
• CVE-2020-26967
• CVE-2020-26965
• CVE-2020-26968
• CVE-2020-26953
• CVE-2020-26962
• CVE-2020-26951
• CVE-2020-26956
• CVE-2020-26963
• CVE-2020-16012

Related notices

• USN-4637-2: firefox-locale-da, firefox-locale-as, firefox-locale-cy, firefox-locale-it, firefox-locale-or, firefox-locale-ur, firefox-locale-zh-hans, firefox-locale-mk, firefox-locale-gd, firefox-locale-gu, firefox-locale-az, firefox-locale-eo, firefox-locale-nso, firefox-locale-ru, firefox-locale-km, firefox-locale-lg, firefox-locale-mn, firefox-locale-tr, firefox-locale-ms, firefox-locale-zu, firefox-locale-fy, firefox-dev, firefox-locale-nn, firefox-locale-pa, firefox-locale-an, firefox-locale-ku, firefox-locale-uk, firefox-locale-sk, firefox-locale-es, firefox-locale-gn, firefox-locale-sw, firefox-locale-hr, firefox-locale-cak, firefox-locale-hy, firefox-locale-he, firefox-locale-ca, firefox-locale-sv, firefox-locale-fi, firefox-locale-te, firefox-locale-el, firefox-locale-ta, firefox-locale-ko, firefox-locale-ro, firefox-locale-hu, firefox-locale-nb, firefox-locale-ne, firefox-locale-ia, firefox-locale-id, firefox-locale-kk, firefox-locale-ar, firefox-locale-hi, firefox-locale-kn, firefox-locale-et, firefox-locale-ga, firefox-locale-de, firefox-locale-fa, firefox-locale-af, firefox, firefox-locale-en, firefox-locale-uz, firefox-locale-vi, firefox-locale-br, firefox-locale-ml, firefox-locale-kab, firefox-locale-fr, firefox-locale-lt, firefox-locale-is, firefox-locale-ka, firefox-geckodriver, firefox-locale-be, firefox-locale-bs, firefox-locale-pt, firefox-locale-si, firefox-locale-mr, firefox-locale-hsb, firefox-mozsymbols, firefox-locale-pl, firefox-locale-eu, firefox-locale-sl, firefox-locale-cs, firefox-locale-zh-hant, firefox-locale-lv, firefox-locale-gl, firefox-locale-bg, firefox-locale-ast, firefox-locale-sq, firefox-locale-oc, firefox-locale-th, firefox-locale-csb, firefox-locale-sr, firefox-locale-bn, firefox-locale-mai, firefox-locale-my, firefox-locale-xh, firefox-locale-ja, firefox-locale-nl
• USN-4647-1: thunderbird-locale-th, thunderbird-locale-pt-br, thunderbird-locale-cak, thunderbird-mozsymbols, thunderbird-locale-sk, thunderbird-locale-es, thunderbird-locale-tr, thunderbird-locale-ast, thunderbird-locale-nl, thunderbird-locale-fr, thunderbird-locale-ca, thunderbird-locale-gd, thunderbird-locale-es-es, thunderbird-locale-it, thunderbird-locale-sv-se, thunderbird-locale-lt, thunderbird-locale-ar, thunderbird-locale-rm, thunderbird-locale-fy-nl, thunderbird-locale-is, thunderbird-locale-nb, thunderbird-locale-hr, thunderbird-locale-sl, thunderbird-locale-he, xul-ext-gdata-provider, thunderbird-locale-sv, thunderbird-locale-gl, thunderbird-locale-en-us, thunderbird-locale-ga-ie, thunderbird-locale-nb-no, thunderbird-locale-pt-pt, thunderbird-locale-kab, thunderbird-locale-be, thunderbird-locale-fi, thunderbird-locale-da, thunderbird-locale-fa, thunderbird-locale-id, thunderbird-locale-kk, thunderbird-locale-bn, thunderbird-locale-vi, thunderbird-locale-pa, thunderbird-locale-ga, thunderbird-locale-ja, thunderbird-locale-ru, thunderbird-locale-nn-no, thunderbird-locale-et, thunderbird-locale-ta-lk, thunderbird-locale-cy, thunderbird-locale-ro, thunderbird-locale-pa-in, thunderbird-dev, thunderbird-locale-sq, thunderbird-locale-sr, thunderbird-locale-en-gb, thunderbird-locale-eu, thunderbird-locale-bg, thunderbird-locale-si, thunderbird-locale-zh-hant, thunderbird-locale-bn-bd, thunderbird-locale-el, thunderbird-locale-dsb, thunderbird-locale-ta, thunderbird-locale-hy, thunderbird-locale-es-ar, thunderbird-locale-hsb, thunderbird-locale-ka, thunderbird-locale-hu, thunderbird, xul-ext-lightning, thunderbird-locale-zh-cn, thunderbird-locale-mk, thunderbird-locale-ko, thunderbird-locale-zh-hans, xul-ext-calendar-timezones, thunderbird-locale-nn, thunderbird-locale-af, thunderbird-locale-pt, thunderbird-locale-uk, thunderbird-locale-cs, thunderbird-gnome-support, thunderbird-locale-fy, thunderbird-locale-br, thunderbird-locale-uz, thunderbird-locale-de, thunderbird-locale-pl, thunderbird-locale-ms, thunderbird-locale-zh-tw, thunderbird-locale-en