medium
5.9
CWE
125 787
Advisory Published
Updated

CVE-2017-3737

First published: Thu Dec 07 2017(Updated: )

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. External References: <a href="https://www.openssl.org/news/secadv/20171207.txt">https://www.openssl.org/news/secadv/20171207.txt</a>

Credit: openssl-security@openssl.org

Affected SoftwareAffected VersionHow to fix
debian/openssl
1.1.1n-0+deb10u3
1.1.1n-0+deb10u6
1.1.1w-0+deb11u1
1.1.1n-0+deb11u5
3.0.11-1~deb12u1
3.0.11-1
OpenSSL OpenSSL=1.0.2b
OpenSSL OpenSSL=1.0.2c
OpenSSL OpenSSL=1.0.2d
OpenSSL OpenSSL=1.0.2e
OpenSSL OpenSSL=1.0.2f
OpenSSL OpenSSL=1.0.2g
OpenSSL OpenSSL=1.0.2h
OpenSSL OpenSSL=1.0.2i
OpenSSL OpenSSL=1.0.2j
OpenSSL OpenSSL=1.0.2k
OpenSSL OpenSSL=1.0.2l
OpenSSL OpenSSL=1.0.2m
Debian Debian Linux=9.0
redhat/openssl<1.0.2
1.0.2
<=10.0

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2017-3737?

    CVE-2017-3737 is a vulnerability in OpenSSL that allows a remote attacker to bypass security restrictions.

  • Which versions of OpenSSL are affected by CVE-2017-3737?

    OpenSSL 1.0.2b and later versions including 1.0.2, 1.1.1n-0+deb10u3, 1.1.1n-0+deb10u6, 1.1.1w-0+deb11u1, 1.1.1n-0+deb11u5, 3.0.11-1~deb12u1, and 3.0.11-1 are affected.

  • How severe is CVE-2017-3737?

    CVE-2017-3737 has a severity rating of 5.9 (medium).

  • What is the CWE ID of CVE-2017-3737?

    The CWE ID of CVE-2017-3737 is CWE-125 and CWE-787.

  • Where can I find more information about CVE-2017-3737?

    You can find more information about CVE-2017-3737 at the following references: [Link 1](https://www.openssl.org/news/secadv/20171207.txt), [Link 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1523513), [Link 3](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1523511).

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