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


Severity

0.0
medium
0
10

    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

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

CVSS Scores

version 3.1
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Snyk

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