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USN-5168-4: NSS regression

7 December 2021

USN-5168-3 introduced a regression in NSS.

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Releases

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.

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 16.04
Ubuntu 14.04

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

References

Related notices

  • USN-5168-1: libnss3-dev, libnss3-tools, libnss3, nss
  • USN-5168-2: thunderbird-locale-ar, thunderbird-locale-zh-hant, thunderbird-locale-hy, thunderbird-locale-fr, thunderbird-locale-fa, thunderbird-locale-ro, thunderbird-locale-mk, thunderbird-locale-uk, thunderbird-locale-th, thunderbird-locale-br, thunderbird-locale-ga, thunderbird-locale-rm, thunderbird-locale-nn-no, thunderbird-locale-nl, thunderbird-locale-ca, thunderbird-locale-uz, thunderbird-locale-hu, thunderbird-locale-nn, thunderbird-locale-pa, thunderbird-locale-en-us, thunderbird-locale-hsb, thunderbird-locale-de, thunderbird-locale-af, thunderbird-locale-zh-cn, thunderbird-locale-cs, thunderbird-locale-kk, thunderbird-locale-hr, thunderbird-locale-sk, thunderbird-dev, thunderbird-locale-da, thunderbird-locale-el, thunderbird-locale-lv, thunderbird-locale-ru, thunderbird-locale-si, thunderbird-locale-sv-se, thunderbird-locale-en, thunderbird-locale-fy-nl, thunderbird-locale-pt-pt, thunderbird-locale-fi, thunderbird-locale-bn-bd, thunderbird-locale-gd, thunderbird-locale-bg, thunderbird-locale-sr, thunderbird-locale-he, thunderbird-locale-sq, thunderbird-locale-ja, xul-ext-lightning, xul-ext-calendar-timezones, thunderbird-locale-es-es, thunderbird-locale-es-ar, thunderbird-locale-kab, thunderbird-locale-ko, thunderbird-locale-vi, thunderbird-locale-fy, thunderbird-locale-bn, thunderbird-locale-ga-ie, thunderbird-locale-pa-in, thunderbird-locale-cy, thunderbird-locale-ast, thunderbird-locale-lt, thunderbird-locale-pt-br, thunderbird-locale-nb, thunderbird-locale-eu, thunderbird-locale-ta-lk, thunderbird-mozsymbols, thunderbird-locale-zh-tw, thunderbird-locale-dsb, thunderbird-locale-sv, thunderbird-locale-is, thunderbird-locale-en-gb, thunderbird-locale-zh-hans, thunderbird, thunderbird-locale-ta, thunderbird-locale-es, thunderbird-locale-be, thunderbird-locale-pt, thunderbird-locale-id, thunderbird-locale-sl, thunderbird-locale-it, thunderbird-locale-ka, thunderbird-locale-cak, thunderbird-locale-nb-no, thunderbird-locale-ms, thunderbird-locale-pl, thunderbird-locale-tr, xul-ext-gdata-provider, thunderbird-gnome-support, thunderbird-locale-gl, thunderbird-locale-et
  • USN-5168-3: libnss3-dev, libnss3-1d, libnss3-nssdb, libnss3, libnss3-tools, nss