CVE-2015-4000

The TLS protocol 1.2 and earlier, when a DHEEXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHEEXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHEEXPORT and then...

CVE-2015-4000

The TLS protocol 1.2 and earlier, when a DHEEXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHEEXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHEEXPORT and then...

SSL/TLS EXPORT_DHE <= 512-bit Export Cipher Suites Supported (Logjam)

The remote host supports EXPORTDHE cipher suites with keys less than or equal to 512 bits. Through cryptanalysis, a third party can find the shared secret in a short amount of time. A man-in-the middle attacker may be able to downgrade the session to use EXPORTDHE cipher suites. Thus, it is...

RHEL 6 / 7 : java-1.7.1-ibm (RHSA-2015:1020) (Bar Mitzvah)

Updated java-1.7.1-ibm packages that fix several security issues are now available for Red Hat Enterprise Linux 6 and 7 Supplementary. Red Hat Product Security has rated this update as having Critical security impact. Common Vulnerability Scoring System CVSS base scores, which give detailed...

CVE-2015-4000

The TLS protocol 1.2 and earlier, when a DHEEXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHEEXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHEEXPORT and then...

TLS protocol man-in-the-middle attack vulnerability

TLS Transport Layer Security is a set of protocols used to provide confidentiality and data integrity between two communicating applications. A security vulnerability exists in the TLS protocol version 1.2 and earlier. When the server enabled the DHEEXPORT cipher suite, the program failed to...

SOL16674 - TLS vulnerability CVE-2015-4000

Note: As of February 17, 2015, AskF5 Security Advisory articles include the Severity value. Security Advisory articles published before this date do not list a Severity value. Vulnerability Recommended Actions If the previous table lists a version in the Versions known to be not vulnerable column...

CVE-2015-4000

CVE-2015-4000 is the Logjam vulnerability: when a server enables DHE_EXPORT ciphers and the client does not, the TLS handshake may downgrade to 512‑bit export‑grade DH, allowing a MITM to decrypt traffic. Public details describe the issue in TLS as a downgrade attack on Diffie–Hellman key exchang...

JDK: ephemeral RSA keys accepted for non-export SSL/TLS cipher suites (FREAK)

GSKit in IBM Tivoli Directory Server ITDS 6.0 before 6.0.0.73-ISS-ITDS-IF0073, 6.1 before 6.1.0.66-ISS-ITDS-IF0066, 6.2 before 6.2.0.42-ISS-ITDS-IF0042, and 6.3 before 6.3.0.35-ISS-ITDS-IF0035 and IBM Security Directory Server ISDS 6.3.1 before 6.3.1.9-ISS-ISDS-IF0009 does not properly restrict T...

SSL/TLS: "Invariance Weakness" vulnerability in RC4 stream cipher

The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic...

SSL/TLS: "Invariance Weakness" vulnerability in RC4 stream cipher

The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic...

Important: Red Hat Security Advisory: java-1.5.0-ibm security update

Updated java-1.5.0-ibm packages that fix several security issues are now available for Red Hat Enterprise Linux 5 and 6 Supplementary. Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System CVSS base scores, which give detailed...

SUSE SLED11 / SLES11 Security Update : libqt4 (SUSE-SU-2014:1121-1)

This update of the QT4 QSSL interface makes it select a set of default ciphers that is recommended for current usage. This update is needed for Konqueror to restrict its cipher set when using https. Note that Tenable Network Security has extracted the preceding description block directly from the...

TLS and SSL Diffie-Hellman Key Downgrade Weakness (CVE-2015-1716; CVE-2015-4000)

A vulnerability has been detected in the way TLS protocol handles weak, legacy cipher suites. An attacker might leverage this vulnerability to intercept secure communications...

CVE-2015-4000

The TLS protocol 1.2 and earlier, when a DHEEXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHEEXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHEEXPORT and then...

UBUNTU-CVE-2015-4000

The TLS protocol 1.2 and earlier, when a DHEEXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHEEXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHEEXPORT and then...

Weak SSL RC4 Cipher Suites (CVE-2013-2566; CVE-2015-2808)

RC4 is a widely supported stream cipher, often preferred by TLS servers and other servers using encrypted sessions. It has long been known to have a variety of cryptographic weaknesses. Recent cryptanalysis results, one of which is the "Bar Mitzvah attack", exploit biases in the RC4 keystream to...

openssl: only allow ephemeral RSA keys in export ciphersuites (FREAK)

It was discovered that OpenSSL would accept ephemeral RSA keys when using non-export RSA cipher suites. A malicious server could make a TLS/SSL client using OpenSSL use a weaker key exchange method...

JDK: ephemeral RSA keys accepted for non-export SSL/TLS cipher suites (FREAK)

GSKit in IBM Tivoli Directory Server ITDS 6.0 before 6.0.0.73-ISS-ITDS-IF0073, 6.1 before 6.1.0.66-ISS-ITDS-IF0066, 6.2 before 6.2.0.42-ISS-ITDS-IF0042, and 6.3 before 6.3.0.35-ISS-ITDS-IF0035 and IBM Security Directory Server ISDS 6.3.1 before 6.3.1.9-ISS-ISDS-IF0009 does not properly restrict T...

SSL/TLS: "Invariance Weakness" vulnerability in RC4 stream cipher

The RC4 algorithm, as used in the TLS protocol and SSL protocol, does not properly combine state data with key data during the initialization phase, which makes it easier for remote attackers to conduct plaintext-recovery attacks against the initial bytes of a stream by sniffing network traffic...