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CVE-2020-1967

CVE-2020-1967 · Segmentation fault in SSL_check_chain

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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 7.5 · High · EPSS 53.3% · Fix available

Published
Updated

Stack: system · network

Affected products and versions

  • openssl

    Versions
    • Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f): Affected

    No fix published

  • openssl Debian:12

    Affected ranges
    • ECOSYSTEM: < 1.1.1g-1

    Update to 1.1.1g-1

  • openssl Debian:13

    Affected ranges
    • ECOSYSTEM: < 1.1.1g-1

    Update to 1.1.1g-1

  • openssl Debian:14

    Affected ranges
    • ECOSYSTEM: < 1.1.1g-1

    Update to 1.1.1g-1

  • openssl Ubuntu:20.04:LTS

    Versions
    • 1.1.1c-1ubuntu4
    • 1.1.1d-2ubuntu3
    • 1.1.1d-2ubuntu6
    • 1.1.1f-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 1.1.1f-1ubuntu2

    Update to 1.1.1f-1ubuntu2

Original sources

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