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Unchecked Error Condition Affecting openssl package, versions <1:1.0.2k-12.el7

Severity

 Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    94.55% (100th percentile)

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  • Snyk ID SNYK-RHEL7-OPENSSL-4782665
  • published 26 Jul 2021
  • disclosed 7 Dec 2017
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Introduced: 7 Dec 2017

CVE-2017-3737 Open this link in a new tab
CWE-391 Open this link in a new tab

How to fix?

Upgrade RHEL:7 openssl to version 1:1.0.2k-12.el7 or higher.
This issue was patched in RHSA-2018:0998.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

OpenSSL 1.0.2 (starting from version 1.0.2b) introduced an "error state" mechanism. The intent was that if a fatal error occurred during a handshake then OpenSSL would move into the error state and would immediately fail if you attempted to continue the handshake. This works as designed for the explicit handshake functions (SSL_do_handshake(), SSL_accept() and SSL_connect()), however due to a bug it does not work correctly if SSL_read() or SSL_write() is called directly. In that scenario, if the handshake fails then a fatal error will be returned in the initial function call. If SSL_read()/SSL_write() is subsequently called by the application for the same SSL object then it will succeed and the data is passed without being decrypted/encrypted directly from the SSL/TLS record layer. In order to exploit this issue an application bug would have to be present that resulted in a call to SSL_read()/SSL_write() being issued after having already received a fatal error. OpenSSL version 1.0.2b-1.0.2m are affected. Fixed in OpenSSL 1.0.2n. OpenSSL 1.1.0 is not affected.

References