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Key Management Errors Affecting openssl1.0 package, versions <1.0.2k-1

low

Snyk CVSS

    Attack Complexity High
    Availability High

    Threat Intelligence

    EPSS 0.76% (81st percentile)
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NVD
5.9 medium
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Red Hat
3.7 low

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  • Snyk ID SNYK-DEBIAN9-OPENSSL10-371906
  • published 4 May 2017
  • disclosed 4 May 2017
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Introduced: 4 May 2017

CVE-2016-7055 Open this link in a new tab
CWE-320 Open this link in a new tab

How to fix?

Upgrade Debian:9 openssl1.0 to version 1.0.2k-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl1.0 package and not the openssl1.0 package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

There is a carry propagating bug in the Broadwell-specific Montgomery multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that handles input lengths divisible by, but longer than 256 bits. Analysis suggests that attacks against RSA, DSA and DH private keys are impossible. This is because the subroutine in question is not used in operations with the private key itself and an input of the attacker's direct choice. Otherwise the bug can manifest itself as transient authentication and key negotiation failures or reproducible erroneous outcome of public-key operations with specially crafted input. Among EC algorithms only Brainpool P-512 curves are affected and one presumably can attack ECDH key negotiation. Impact was not analyzed in detail, because pre-requisites for attack are considered unlikely. Namely multiple clients have to choose the curve in question and the server has to share the private key among them, neither of which is default behaviour. Even then only clients that chose the curve will be affected.

References