USN-4936-1: Thunderbird vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS

Packages

• thunderbird - Mozilla Open Source mail and newsgroup client

Details

Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, or execute arbitrary code. (CVE-2021-23968,
CVE-2021-23969, CVE-2021-23973, CVE-2021-23978)

It was discovered that Thunderbird may keep key material in memory in some
circumstances. A local attacker could potentially exploit this to obtain
private keys. (CVE-2021-29950)

Update instructions

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

Ubuntu 20.10

• thunderbird - 1:78.8.1+build1-0ubuntu0.20.10.1

Ubuntu 20.04

• thunderbird - 1:78.8.1+build1-0ubuntu0.20.04.1

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

References

• CVE-2021-23969
• CVE-2021-23978
• CVE-2021-23968
• CVE-2021-23973
• CVE-2021-29950

Related notices

• USN-4756-1: firefox-locale-uz, firefox-locale-fi, firefox-locale-en, firefox-locale-de, firefox-locale-cak, firefox-locale-hsb, firefox-locale-ar, firefox-locale-eo, firefox-locale-bn, firefox-locale-ca, firefox-locale-fy, firefox-locale-eu, firefox-locale-ur, firefox-dev, firefox-locale-mk, firefox-locale-xh, firefox-locale-ml, firefox-locale-ast, firefox-locale-ko, firefox-locale-sk, firefox-locale-pl, firefox-locale-lg, firefox-mozsymbols, firefox-locale-af, firefox-locale-et, firefox-locale-ro, firefox-locale-kab, firefox-locale-km, firefox-locale-zh-hans, firefox-locale-sr, firefox-locale-ta, firefox-locale-ms, firefox-locale-pt, firefox-locale-nso, firefox-locale-si, firefox-locale-az, firefox-locale-csb, firefox-locale-sq, firefox-locale-bg, firefox-locale-gu, firefox-locale-sl, firefox-locale-pa, firefox-locale-kn, firefox-locale-es, firefox-locale-te, firefox, firefox-locale-mn, firefox-locale-kk, firefox-locale-nb, firefox-locale-gn, firefox-locale-as, firefox-locale-gl, firefox-locale-sv, firefox-locale-vi, firefox-locale-hy, firefox-locale-it, firefox-locale-id, firefox-locale-hu, firefox-locale-he, firefox-locale-mai, firefox-locale-ia, firefox-locale-cs, firefox-locale-ja, firefox-locale-da, firefox-locale-uk, firefox-locale-zu, firefox-locale-nl, firefox-locale-gd, firefox-locale-is, firefox-locale-be, firefox-locale-fa, firefox-locale-an, firefox-locale-lv, firefox-locale-nn, firefox-locale-lt, firefox-geckodriver, firefox-locale-th, firefox-locale-ku, firefox-locale-zh-hant, firefox-locale-bs, firefox-locale-ne, firefox-locale-or, firefox-locale-cy, firefox-locale-hi, firefox-locale-br, firefox-locale-ka, firefox-locale-oc, firefox-locale-ga, firefox-locale-fr, firefox-locale-tr, firefox-locale-el, firefox-locale-my, firefox-locale-ru, firefox-locale-hr, firefox-locale-mr, firefox-locale-sw