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Uncontrolled Recursion Affecting openssl1.0 package, versions <1.0.2n-1ubuntu5

Severity

 Recommended
0.0
medium
0
10

Based on Ubuntu security rating

    Threat Intelligence

    EPSS
    0.91% (83rd percentile)

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  • Snyk ID SNYK-UBUNTU1804-OPENSSL10-371877
  • published 27 Mar 2018
  • disclosed 27 Mar 2018
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Introduced: 27 Mar 2018

CVE-2018-0739 Open this link in a new tab
CWE-674 Open this link in a new tab

How to fix?

Upgrade Ubuntu:18.04 openssl1.0 to version 1.0.2n-1ubuntu5 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 Ubuntu. See How to fix? for Ubuntu:18.04 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).

References