Description
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.
Analysis and contextual insights are available on OpenCVE Cloud.
Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
Debian DSA |
DSA-4065-1 | openssl1.0 security update |
Ubuntu USN |
USN-3512-1 | OpenSSL vulnerabilities |
References
History
Wed, 16 Jul 2025 13:45:00 +0000
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Status: PUBLISHED
Assigner: openssl
Published:
Updated: 2024-09-17T03:53:31.262Z
Reserved: 2016-12-16T00:00:00.000Z
Link: CVE-2017-3737
No data.
Status : Modified
Published: 2017-12-07T16:29:00.193
Modified: 2026-05-13T00:24:29.033
Link: CVE-2017-3737
OpenCVE Enrichment
No data.
Debian DSA
Ubuntu USN