USN-5168-4: NSS regression

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• nss - Network Security Service library

Details

USN-5168-3 fixed a vulnerability in NSS. Unfortunately that update introduced
a regression that could break SSL connections. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Tavis Ormandy discovered that NSS incorrectly handled verifying DSA/RSA-PSS
signatures. A remote attacker could use this issue to cause NSS to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 16.04

• libnss3 - 2:3.28.4-0ubuntu0.16.04.14+esm2
  Available with Ubuntu Pro

Ubuntu 14.04

• libnss3 - 2:3.28.4-0ubuntu0.14.04.5+esm10
  Available with Ubuntu Pro

After a standard system update you need to restart any applications that
use NSS, such as Evolution, to make all the necessary changes.

References

• CVE-2021-43527

Related notices

• USN-5168-1: libnss3-tools, libnss3-dev, nss, libnss3
• USN-5168-2: thunderbird-locale-lv, 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
• USN-5168-3: libnss3-1d, libnss3-nssdb, libnss3-dev, libnss3-tools, nss, libnss3