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NULL Pointer Dereference Affecting openssl-libs package, versions <1:1.1.1g-15.el8_3

high

Snyk CVSS

    Attack Complexity High
    Availability High

    Threat Intelligence

    EPSS 0.33% (71st percentile)
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NVD
5.9 medium
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SUSE
7.5 high
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Red Hat
5.9 medium

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  • Snyk ID SNYK-CENTOS8-OPENSSLLIBS-2091880
  • published 26 Jul 2021
  • disclosed 25 Mar 2021
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Introduced: 25 Mar 2021

CVE-2021-3449 Open this link in a new tab
CWE-476 Open this link in a new tab

How to fix?

Upgrade Centos:8 openssl-libs to version 1:1.1.1g-15.el8_3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl-libs package and not the openssl-libs package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).

References