Uncontrolled Recursion Affecting openssl package, versions <1.1.0f-3+deb9u2


0.0
medium

Snyk CVSS

    Attack Complexity Low
    User Interaction Required
    Availability High

    Threat Intelligence

    EPSS 1.14% (85th percentile)
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NVD
6.5 medium
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SUSE
7.5 high
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Red Hat
6.5 medium

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  • Snyk ID SNYK-DEBIAN9-OPENSSL-373828
  • published 27 Mar 2018
  • disclosed 27 Mar 2018

How to fix?

Upgrade Debian:9 openssl to version 1.1.0f-3+deb9u2 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 Debian. See How to fix? for Debian:9 relevant fixed versions and status.

Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).