LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks

A flaw was found in the way the TLS protocol composes the Diffie-Hellman exchange for both export and non-export grade cipher suites. An attacker could use this flaw to downgrade a DHE connection to use export-grade key sizes, which could then be broken by sufficient pre-computation. This can lea...

Ubuntu: Security Advisory (USN-2673-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2015 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

USN-2673-1: Thunderbird vulnerabilities

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property...

USN-2673-1 thunderbird vulnerabilities

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property...

LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks

A flaw was found in the way the TLS protocol composes the Diffie-Hellman exchange for both export and non-export grade cipher suites. An attacker could use this flaw to downgrade a DHE connection to use export-grade key sizes, which could then be broken by sufficient pre-computation. This can lea...

LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks

A flaw was found in the way the TLS protocol composes the Diffie-Hellman exchange for both export and non-export grade cipher suites. An attacker could use this flaw to downgrade a DHE connection to use export-grade key sizes, which could then be broken by sufficient pre-computation. This can lea...

LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks

A flaw was found in the way the TLS protocol composes the Diffie-Hellman exchange for both export and non-export grade cipher suites. An attacker could use this flaw to downgrade a DHE connection to use export-grade key sizes, which could then be broken by sufficient pre-computation. This can lea...

FreeBSD : mysql -- SSL Downgrade (36bd352d-299b-11e5-86ff-14dae9d210b8) (BACKRONYM)

Duo Security reports : Researchers have identified a serious vulnerability in some versions of Oracle's MySQL database product that allows an attacker to strip SSL/TLS connections of their security wrapping transparently. %NASLMINLEVEL 70300 C Tenable Network Security, Inc. The descriptive text a...

Ubuntu 14.04 LTS : NSS vulnerabilities (USN-2672-1)

The remote Ubuntu 14.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-2672-1 advisory. Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a...

Ubuntu: Security Advisory (USN-2672-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2015 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

USN-2672-1: NSS vulnerabilities

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property...

Mozilla Thunderbird < 38.1 Multiple Vulnerabilities (Mac OS X) (Logjam)

The version of Thunderbird installed on the remote Mac OS X host is prior to 38.1. It is, therefore, affected by multiple vulnerabilities : - A security downgrade vulnerability exists due to a flaw in Network Security Services NSS. When a client allows for a ECDHEECDSA exchange, but the server do...

Mozilla Thunderbird < 38.1 Multiple Vulnerabilities (Logjam)

The version of Thunderbird installed on the remote Windows host is prior to 38.1. It is, therefore, affected by multiple vulnerabilities : - A security downgrade vulnerability exists due to a flaw in Network Security Services NSS. When a client allows for a ECDHEECDSA exchange, but the server doe...

Firefox ESR < 38.1 Multiple Vulnerabilities (Mac OS X) (Logjam)

The version of Firefox ESR installed on the remote Mac OS X host is\ prior to 38.1. It is, therefore, affected by multiple vulnerabilities : - A security downgrade vulnerability exists due to a flaw in Network Security Services NSS. When a client allows for a ECDHEECDSA exchange, but the server...

Firefox ESR < 38.1 Multiple Vulnerabilities (Logjam)

The version of Firefox ESR installed on the remote Windows host is prior to 38.1. It is, therefore, affected by multiple vulnerabilities : - A security downgrade vulnerability exists due to a flaw in Network Security Services NSS. When a client allows for a ECDHEECDSA exchange, but the server doe...

Firefox < 39.0 Multiple Vulnerabilities (Logjam)

The version of Firefox installed on the remote Windows host is prior to 39.0. It is, therefore, affected by multiple vulnerabilities : - A security downgrade vulnerability exists due to a flaw in Network Security Services NSS. When a client allows for a ECDHEECDSA exchange, but the server does no...

TLS DHE_EXPORT Information Disclosure (MS15-055; CVE-2015-1716; CVE-2015-4000)

An information disclosure vulnerability exists in multiple implementations of TLS 1.2 and earlier, when Ephemeral Diffie-Hellman cipher suites including their EXPORT versions are used. It is possible to downgrade a DHE cipher to a DHEEXPORT cipher, which can be broken, and thereby perform a...

NSS accepts export-length DHE keys with regular DHE cipher suites — Mozilla

Security researcher Matthew Green reported a Diffie–Hellman DHE key processing issue in Network Security Services NSS where a man-in-the-middle MITM attacker can force a server to downgrade TLS connections to 512-bit export-grade cryptography by modifying client requests to include only...

HSTS Missing From HTTPS Server

The remote HTTPS server is not enforcing HTTP Strict Transport Security HSTS. HSTS is an optional response header that can be configured on the server to instruct the browser to only communicate via HTTPS. The lack of HSTS allows downgrade attacks, SSL-stripping man-in-the-middle attacks, and...

LOGJAM: TLS connections which support export grade DHE key-exchange are vulnerable to MITM attacks

A flaw was found in the way the TLS protocol composes the Diffie-Hellman exchange for both export and non-export grade cipher suites. An attacker could use this flaw to downgrade a DHE connection to use export-grade key sizes, which could then be broken by sufficient pre-computation. This can lea...