NULL Pointer Dereference Affecting openssl package, versions <1.1.1g-r0



Snyk's Security Team recommends NVD's CVSS assessment

    Threat Intelligence

    8.1% (95th percentile)

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  • Snyk ID SNYK-ALPINE312-OPENSSL-588141
  • published 21 Jul 2020
  • disclosed 21 Apr 2020

How to fix?

Upgrade Alpine:3.12 openssl to version 1.1.1g-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Alpine. See How to fix? for Alpine:3.12 relevant fixed versions and status.

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).


CVSS Scores

version 3.1
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7.5 high
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7.5 high
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Red Hat

7.5 high