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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

Red Hat Security Advisory 2018-2186-01
Posted Jul 12, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2186-01 - This release adds the new Apache HTTP Server 2.4.29 packages that are part of the JBoss Core Services offering. This release serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.23, and includes bug fixes and enhancements. Issues addressed include a remote SQL injection vulnerability.

tags | advisory, remote, web, sql injection
systems | linux, redhat
advisories | CVE-2016-2182, CVE-2016-6302, CVE-2016-6306, CVE-2016-7055, CVE-2017-3731, CVE-2017-3732, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
SHA-256 | 3ae001c838be7fe63f3f17218120c104c0337869b4012d6ba095f9df05b116a8
Red Hat Security Advisory 2018-2185-01
Posted Jul 12, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2185-01 - This release adds the new Apache HTTP Server 2.4.29 packages that are part of the JBoss Core Services offering. This release serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.23, and includes bug fixes and enhancements. Issues addressed include a remote SQL injection vulnerability.

tags | advisory, remote, web, sql injection
systems | linux, redhat
advisories | CVE-2016-2182, CVE-2016-6302, CVE-2016-6306, CVE-2016-7055, CVE-2017-3731, CVE-2017-3732, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
SHA-256 | 7e87933107e4717883ce5385c59d3741b7ecc791f11d4f3340888ec72b50870b
Red Hat Security Advisory 2018-2187-01
Posted Jul 12, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2187-01 - This release adds the new Apache HTTP Server 2.4.29 packages that are part of the JBoss Core Services offering. This release serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.23, and includes bug fixes and enhancements. Issues addressed include out-of-bounds access.

tags | advisory, web
systems | linux, redhat
advisories | CVE-2016-2182, CVE-2016-6302, CVE-2016-6306, CVE-2016-7055, CVE-2017-3731, CVE-2017-3732, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
SHA-256 | 3cf3a4008f8603285e63957d08f151b7215154836af4d8dfe0c8ddd59cc6c556
Red Hat Security Advisory 2018-0998-01
Posted Apr 11, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0998-01 - OpenSSL is a toolkit that implements the Secure Sockets Layer and Transport Layer Security protocols, as well as a full-strength general-purpose cryptography library. Issues addressed include an overflow issue.

tags | advisory, overflow, protocol
systems | linux, redhat
advisories | CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
SHA-256 | 6168c059542581f19fa9bbb4b7ec633dce320694f1a1867ac12680acc809cebe
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
SHA-256 | fce3728192f2ad29f4f85aa453b99dae4b60a8dc3c7ceb2e2bc45239433e0b60
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
SHA-256 | a103b944d6f8a85749386afed57846e8edac57db3a95092b4bd3128777b3642f
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
SHA-256 | df944e02ba3ab7e2c344e82703dedcc6aaf7c147044b9875407518d20e3be9a5
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
SHA-256 | bb3377d0fb3c1fc7d239e5446ade3da5c43af286b662042e0a558c54cd6d4ed5
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
SHA-256 | 370babb75f278c39e0c50e8c4e7493bc0f18db6867478341a832a982fd15a8fe
OpenSSL Security Advisory 20171207
Posted Dec 7, 2017
Site openssl.org

OpenSSL Security Advisory 20171207 - 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. Other issues were also addressed.

tags | advisory
advisories | CVE-2015-3193, CVE-2016-0701, CVE-2017-3732, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738
SHA-256 | 5b23d35b31c30e0ba27356ef231c18b5e034386ca01935b4c9740a2cf6a7469b
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