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Gentoo Linux Security Advisory                           GLSA 202105-31
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: Nettle: Denial of service
      Date: May 26, 2021
      Bugs: #780483
        ID: 202105-31

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Synopsis
=======
A vulnerability in Nettle could lead to a Denial of Service condition.

Background
=========
Nettle is a cryptographic library that is designed to fit easily in
almost any context: In cryptographic toolkits for object-oriented
languages, such as C++, Python, or Pike, in applications like lsh or
GnuPG, or even in kernel space.

Affected packages
================
     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  dev-libs/nettle              < 3.7.2                    >= 3.7.2

Description
==========
It was discovered that Nettle incorrectly handled signature
verification.

Impact
=====
A remote attacker could send a specially crafted valid-looking input
signature, possibly resulting in a Denial of Service condition or force
an invalid signature.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Nettle users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=dev-libs/nettle-3.7.2"

References
=========
[ 1 ] CVE-2021-20305
       https://nvd.nist.gov/vuln/detail/CVE-2021-20305

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202105-31

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/