NULL Pointer Dereference Affecting openssl-libs package, versions <2:1.1.1g-15.ksplice1.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-ORACLE8-OPENSSLLIBS-2581455
  • published 10 Apr 2022
  • disclosed 25 Mar 2021

How to fix?

Upgrade Oracle:8 openssl-libs to version 2:1.1.1g-15.ksplice1.el8_3 or higher.
This issue was patched in ELSA-2021-9151.

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 Oracle. See How to fix? for Oracle: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).