(MS15-055) Vulnerability in Schannel Could Allow Information Disclosure (3061518)
Severity: HIGH
CVE Identifier: CVE-2015-1716
Advisory Date: MAY 19, 2015
DESCRIPTION
This security update addresses a vulnerability in Microsoft Windows, which could allow information disclosure when Secure Channel (Schannel) allows the use of a weak Diffie-Hellman ephemeral (DFE) key length of 512 bits in an encrypted TLS session. Allowing 512-bit DHE keys makes DHE key exchanges weak and vulnerable to various attacks. A server needs to support 512-bit DHE key lengths for an attack to be successful; the minimum allowable DHE key length in default configurations of Windows servers is 1024 bits.
SOLUTION
AFFECTED SOFTWARE AND VERSION
- Windows Server 2003 Service Pack 2
- Windows Server 2003 x64 Edition Service Pack 2
- Windows Server 2003 with SP2 for Itanium-based Systems
- Windows Vista Service Pack 2
- Windows Vista x64 Edition Service Pack 2
- Windows Server 2008 for Itanium-based Systems Service Pack 2
- Windows 8.1 for x64-based Systems
- Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
- Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- Windows Server 2012 R2 (Server Core installation)
- Windows Server 2008 for 32-bit Systems Service Pack 2
- Windows Server 2008 for x64-based Systems Service Pack 2
- Windows 7 for 32-bit Systems Service Pack 1
- Windows 7 for x64-based Systems Service Pack 1
- Windows Server 2008 R2 for x64-based Systems Service Pack 1
- Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
- Windows 8 for 32-bit Systems
- Windows 8 for x64-based Systems
- Windows 8.1 for 32-bit Systems
- Windows Server 2012
- Windows Server 2012 R2
- Windows RT
- Windows RT 8.1
- Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
- Windows Server 2012 (Server Core installation)
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