NULL Pointer Dereference Affecting openssl package, versions <1.1.1j-1ubuntu3


Severity

high

    Threat Intelligence

    EPSS
    0.35% (72nd percentile)

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  • Snyk ID SNYK-UBUNTU2110-OPENSSL-1736059
  • published 25 Mar 2021
  • disclosed 25 Mar 2021

How to fix?

Upgrade Ubuntu:21.10 openssl to version 1.1.1j-1ubuntu3 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 Ubuntu. See How to fix? for Ubuntu:21.10 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

CVSS Scores

version 3.1
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Snyk

5.9 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High
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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