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Vulnerability of Nettle: Man-in-the-Middle via Signature Verification Functions

Synthesis of the vulnerability 

An attacker can act as a Man-in-the-Middle via Signature Verification Functions on Nettle, in order to read or write data in the session.
Impacted software: Debian, BIG-IP Hardware, TMOS, Fedora, openSUSE Leap, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 09/04/2021.
Références of this announce: CVE-2021-20305, DSA-4933-1, FEDORA-2021-454a0f6f76, K33101555, openSUSE-SU-2021:0635-1, RHSA-2021:1145-01, RHSA-2021:1206-01, RHSA-2021:1245-01, RHSA-2021:1246-01, RHSA-2021:2280-01, RHSA-2021:2356-01, SSA:2021-145-01, SSB-439005, SUSE-SU-2021:1399-1, SUSE-SU-2021:1412-1, USN-4906-1, VIGILANCE-VUL-35038.

Description of the vulnerability 

An attacker can act as a Man-in-the-Middle via Signature Verification Functions on Nettle, in order to read or write data in the session.
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This computer weakness impacts software or systems such as Debian, BIG-IP Hardware, TMOS, Fedora, openSUSE Leap, RHEL, SIMATIC, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability note is medium.

The trust level is of type confirmed by the editor, with an origin of internet server.

An attacker with a expert ability can exploit this cybersecurity threat.

Solutions for this threat 

Debian 10: new nettle packages.
New packages are available:
  Debian 10: nettle 3.4.1-1+deb10u1

F5 BIG-IP: solution for Nettle.
The solution is indicated in information sources.

Fedora 33: new gnutls packages.
New packages are available:
  Fedora 33: gnutls 3.6.16-1.fc33

openSUSE Leap 15.2: new libnettle packages.
New packages are available:
  openSUSE Leap 15.2: libnettle6 3.4.1-lp152.4.3.1

RHEL 7.6: new nettle packages.
New packages are available:
  RHEL 7.6: nettle 2.7.1-9.el7_6

RHEL 7.7: new nettle packages.
New packages are available:
  RHEL 7.7: nettle 2.7.1-9.el7_7

RHEL 7.9: new nettle packages.
New packages are available:
  RHEL 7.9: nettle 2.7.1-9.el7_9

RHEL 8.1-8.2: new gnutls/nettle packages.
New packages are available:
  RHEL 8.1: gnutls 3.6.8-10.el8_1, nettle 3.4.1-2.el8_1
  RHEL 8.2: gnutls 3.6.8-12.el8_2, nettle 3.4.1-2.el8_2

RHEL 8.3: new gnutls/nettle packages.
New packages are available:
  RHEL 8.3: gnutls 3.6.14-8.el8_3, nettle 3.4.1-4.el8_3

SIMATIC S7-1500 CPU 1518: workaround for GNU/Linux Vulnerabilities.
A workaround is indicated in the information source.

Slackware: new gnutls packages.
New packages are available:
  Slackware 14.2: gnutls 3.6.16-*-1_slack14.2

SUSE LE 12: new libnettle packages.
New packages are available:
  SUSE LE 12 SP5: libnettle4 2.7.1-13.3.1
  SUSE LE 12 SP4: libnettle4 2.7.1-13.3.1
  SUSE LE 12 SP3: libnettle4 2.7.1-13.3.1
  SUSE LE 12 SP2: libnettle 2.7.1-13.3.1

SUSE LE 15: new libnettle packages.
New packages are available:
  SUSE LE 15 RTM: libnettle6 3.4.1-4.15.1
  SUSE LE 15 SP1: libnettle6 3.4.1-4.15.1
  SUSE LE 15 SP2: libnettle6 3.4.1-4.15.1
  SUSE LE 15 SP3: libnettle6 3.4.1-4.15.1

Ubuntu: new libnettle packages.
New packages are available:
  Ubuntu 20.10: libnettle8 3.6-2ubuntu0.1
  Ubuntu 20.04 LTS: libnettle7 3.5.1+really3.5.1-2ubuntu0.1
  Ubuntu 18.04 LTS: libnettle6 3.4-1ubuntu0.1
  Ubuntu 16.04 LTS: libnettle6 3.2-1ubuntu0.16.04.2
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