NULL Pointer Dereference Affecting openssl-1_1 package, versions <1.1.1d-11.20.1


0.0
high
0
10

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.35% (72nd 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-SLES153-OPENSSL11-3251966
  • published 27 Jan 2023
  • disclosed 13 Jul 2022

How to fix?

Upgrade SLES:15.3 openssl-1_1 to version 1.1.1d-11.20.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl-1_1 package and not the openssl-1_1 package as distributed by SLES. See How to fix? for SLES:15.3 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