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CVE-2017-3737

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 201712-03
Posted Dec 15, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201712-3 - Multiple vulnerabilities have been found in OpenSSL, the worst of which may lead to a Denial of Service condition. Versions less than 1.0.2n are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2017-3735, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
MD5 | 424fb2f54f934bbdb186d90e169c3306
Ubuntu Security Notice USN-3512-1
Posted Dec 12, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3512-1 - David Benjamin discovered that OpenSSL did not correctly prevent buggy applications that ignore handshake errors from subsequently calling certain functions. It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery multiplication procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2017-3737, CVE-2017-3738
MD5 | 0cc0ee9bc2108ca4e7a6bf8e0410739c
Slackware Security Advisory - openssl Updates
Posted Dec 12, 2017
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New openssl packages are available for Slackware 14.2 and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2017-3737, CVE-2017-3738
MD5 | e6e09e7e8a766023e9521e28de89fbdf
FreeBSD Security Advisory - FreeBSD-SA-17:12.openssl
Posted Dec 12, 2017
Site security.freebsd.org

FreeBSD Security Advisory - Invoking SSL_read()/SSL_write() while in an error state causes data to be 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. Various other issues were addressed.

tags | advisory
systems | freebsd, bsd
advisories | CVE-2017-3737, CVE-2017-3738
MD5 | 3475ce3c92c45de6eb4652ec337d3e53
OpenSSL Toolkit 1.0.2n
Posted Dec 9, 2017
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide.

Changes: Read/write after SSL object in error state addressed. rsaz_1024_mul_avx2 overflow bug on x86_64 addressed. Various other issues address.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2017-3737, CVE-2017-3738
MD5 | 13bdc1b1d1ff39b6fd42a255e74676a4
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