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RHEL 6 / 7 : gnutls (RHSA-2016:0012) (SLOTH)

medium Nessus Plugin ID 87812

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Synopsis

The remote Red Hat host is missing one or more security updates.

Description

Updated gnutls packages that fix one security issue are now available for Red Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security (TLS).

A flaw was found in the way TLS 1.2 could use the MD5 hash function for signing ServerKeyExchange and Client Authentication packets during a TLS handshake. A man-in-the-middle attacker able to force a TLS connection to use the MD5 hash function could use this flaw to conduct collision attacks to impersonate a TLS server or an authenticated TLS client. (CVE-2015-7575)

All gnutls users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. For the update to take effect, all applications linked to the GnuTLS library must be restarted.

Solution

Update the affected packages.

See Also

https://access.redhat.com/articles/2112261

https://www.mitls.org/pages/attacks/SLOTH

https://access.redhat.com/errata/RHSA-2016:0012

https://access.redhat.com/security/cve/cve-2015-7575

Plugin Details

Severity: Medium

ID: 87812

File Name: redhat-RHSA-2016-0012.nasl

Version: 2.20

Type: local

Agent: unix

Published: 1/8/2016

Updated: 2/5/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:gnutls-debuginfo, p-cpe:/a:redhat:enterprise_linux:gnutls-dane, p-cpe:/a:redhat:enterprise_linux:gnutls, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:7.3, cpe:/o:redhat:enterprise_linux:7.4, cpe:/o:redhat:enterprise_linux:7.5, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:gnutls-c%5c%2b%5c%2b, p-cpe:/a:redhat:enterprise_linux:gnutls-guile, cpe:/o:redhat:enterprise_linux:6.7, cpe:/o:redhat:enterprise_linux:7.7, p-cpe:/a:redhat:enterprise_linux:gnutls-utils, p-cpe:/a:redhat:enterprise_linux:gnutls-devel, cpe:/o:redhat:enterprise_linux:7.2, cpe:/o:redhat:enterprise_linux:7.6

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 1/7/2016

Vulnerability Publication Date: 1/9/2016

Reference Information

CVE: CVE-2015-7575

RHSA: 2016:0012