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CVE-2017-3738

Status Candidate

Overview

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH1024 are considered just feasible, because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.

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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