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CVE-2018-0732

Status Candidate

Overview

During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).

Related Files

Debian Security Advisory 4355-1
Posted Dec 20, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4355-1 - Several local side channel attacks and a denial of service via large Diffie-Hellman parameters were discovered in OpenSSL, a Secure Sockets Layer toolkit.

tags | advisory, denial of service, local
systems | linux, debian
advisories | CVE-2018-0732, CVE-2018-0734, CVE-2018-0737, CVE-2018-5407
MD5 | cb9dcaf98d42d86ba8f80a539e4c194e
Debian Security Advisory 4348-1
Posted Dec 3, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4348-1 - Several local side channel attacks and a denial of service via large Diffie-Hellman parameters were discovered in OpenSSL, a Secure Sockets Layer toolkit.

tags | advisory, denial of service, local
systems | linux, debian
advisories | CVE-2018-0732, CVE-2018-0734, CVE-2018-0735, CVE-2018-0737, CVE-2018-5407
MD5 | 9f26279cb338cd2494304ede9e253c79
Gentoo Linux Security Advisory 201811-03
Posted Nov 9, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201811-3 - A vulnerability in OpenSSL might allow remote attackers to cause a Denial of Service condition. Versions less than 1.0.2o-r6 are affected.

tags | advisory, remote, denial of service
systems | linux, gentoo
advisories | CVE-2018-0732
MD5 | fc3554e4ddb44a3d39e9d3767694abff
Red Hat Security Advisory 2018-3505-01
Posted Nov 6, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-3505-01 - Red Hat Ansible Tower 3.3.1 is now available and contains a large amount of security fixes.

tags | advisory
systems | linux, redhat
advisories | CVE-2015-9262, CVE-2016-9396, CVE-2017-1000050, CVE-2017-18267, CVE-2017-3735, CVE-2018-0495, CVE-2018-0732, CVE-2018-0737, CVE-2018-0739, CVE-2018-1000805, CVE-2018-1060, CVE-2018-1061, CVE-2018-10733, CVE-2018-10767, CVE-2018-10768, CVE-2018-10844, CVE-2018-10845, CVE-2018-10846, CVE-2018-12384, CVE-2018-12910, CVE-2018-13988, CVE-2018-14679, CVE-2018-14680, CVE-2018-14681, CVE-2018-14682, CVE-2018-16837, CVE-2018-17456
MD5 | b7af30db27ef5f7b266ad41827d5a000
Red Hat Security Advisory 2018-3221-01
Posted Oct 31, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-3221-01 - 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 a denial of service vulnerability.

tags | advisory, denial of service, protocol
systems | linux, redhat
advisories | CVE-2017-3735, CVE-2018-0495, CVE-2018-0732, CVE-2018-0737, CVE-2018-0739
MD5 | 93916b2adeb03f0b0cd24738dda507b5
Red Hat Security Advisory 2018-2552-01
Posted Aug 23, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2552-01 - Red Hat Openshift Application Runtimes provides an application platform that reduces the complexity of developing and operating applications for OpenShift as a containerized platform. This release of RHOAR Node.js 8.11.4 serves as a replacement for RHOAR Node.js 8.11.3, and includes bug fixes and enhancements. For further information, refer to the Release Notes linked to in the References section. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2018-0732, CVE-2018-12115
MD5 | bf62787b7c30e458e682ccb474bd4e23
Red Hat Security Advisory 2018-2553-01
Posted Aug 22, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-2553-01 - Red Hat Openshift Application Runtimes provides an application platform that reduces the complexity of developing and operating applications for OpenShift as a containerized platform. This release of RHOAR Node.js 10.9.0 serves as a replacement for RHOAR Node.js 10.8.0, and includes bug fixes and enhancements. For further information, refer to the Release Notes linked to in the References section. Issues addressed include a denial of service vulnerability.

tags | advisory, denial of service
systems | linux, redhat
advisories | CVE-2018-0732, CVE-2018-12115, CVE-2018-7166
MD5 | e39620c843ecb8491a4b8c69daeab8f1
OpenSSL Toolkit 1.1.0i
Posted Aug 17, 2018
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: Addressed a client denial of service due to a large DH parameter addressed. Cache timing vulnerability fixed. Various other updates and fixes.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2018-0732, CVE-2018-0737
MD5 | 9495126aafd2659d357ea66a969c3fe1
Slackware Security Advisory - openssl Updates
Posted Aug 14, 2018
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-2018-0732, CVE-2018-0737
MD5 | d5b9ce8668d747aec7c4bda0e16c5502
Ubuntu Security Notice USN-3692-1
Posted Jun 26, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3692-1 - Keegan Ryan discovered that OpenSSL incorrectly handled ECDSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private ECDSA keys. Guido Vranken discovered that OpenSSL incorrectly handled very large prime values during a key agreement. A remote attacker could possibly use this issue to consume resources, leading to a denial of service. Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private RSA keys. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2018-0495, CVE-2018-0732, CVE-2018-0737
MD5 | 56cd52a341cc1f84b0df7977939c8ef3
Ubuntu Security Notice USN-3692-2
Posted Jun 26, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3692-2 - USN-3692-1 fixed a vulnerability in OpenSSL. This update provides the corresponding update for Ubuntu 12.04 ESM. Keegan Ryan discovered that OpenSSL incorrectly handled ECDSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private ECDSA keys. Various other issues were also addressed.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2017-0737, CVE-2018-0495, CVE-2018-0732, CVE-2018-0737
MD5 | 9be3e658c83ed593e3a872b40b7f8a54
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