Logjam Vulnerability (CVE-2015-4000)
Publish date: August 14, 2015
CVE Identifier: CVE-2015-4000
Advisory Date: AUG 14, 2015
DESCRIPTION
The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice. This allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, which could then result in an attacker being able to monitor encrypted communications by being able to decrypt them. This is known as the "Logjam" vulnerability.
SOLUTION
Featured Stories
- The Mirage of AI Programming: Hallucinations and Code IntegrityThe adoption of large language models (LLMs) and Generative Pre-trained Transformers (GPTs), such as ChatGPT, by leading firms like Microsoft, Nuance, Mix and Google CCAI Insights, drives the industry towards a series of transformative changes. As the use of these new technologies becomes prevalent, it is important to understand their key behavior, advantages, and the risks they present.Read more
- Open RAN: Attack of the xAppsThis article discusses two O-RAN vulnerabilities that attackers can exploit. One vulnerability stems from insufficient access control, and the other arises from faulty message handlingRead more
- A Closer Exploration of Residential Proxies and CAPTCHA-Breaking ServicesThis article, the final part of a two-part series, focuses on the details of our technical findings and analyses of select residential proxies and CAPTCHA-solving services.Read more
- How Residential Proxies and CAPTCHA-Solving Services Become Agents of AbuseThis article, the first of a two-part series, provides insights on how abusers and cybercriminals use residential proxies and CAPTCHA-solving services to enable bots, scrapers, and stuffers, and proposes security countermeasures for organizations.Read more