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SSLv3 Padding Oracle on Downgraded Legacy Encryption Vulnerability (POODLE) | Report Data

Analysis:

During the analysis, it was observed that the remote host is affected by a man-in-the-middle (MitM) information disclosure vulnerability known as POODLE. The vulnerability is due to the way SSL 3.0 handles padding bytes when decrypting messages encrypted using block ciphers in cipher block chaining (CBC) mode. Please refer to the below-provided evidence:

Impact:

The POODLE attack can be used against any system or application that supports SSL 3.0 with CBC mode ciphers. This affects most current browsers and websites, but also includes any software that either reference a vulnerable SSL/TLS library (e.g. OpenSSL) or implements the SSL/TLS protocol suite itself. By exploiting this vulnerability in a likely web-based scenario, an attacker can gain access to sensitive data passed within the encrypted web session, such as passwords, cookies and other authentication tokens that can then be used to gain more complete access to a website (impersonating that user, accessing database content, etc.).

Recommendation:

It is recommended to disable SSLv3.0. Services that must support SSLv3 should enable the TLS Fallback SCSV mechanism until SSLv3 can be disabled. TLS_FALLBACK_SCSV is a protocol extension that prevents MITM attackers from being able to force a protocol downgrade. OpenSSL has added support for TLS_FALLBACK_SCSV to their latest versions and recommends the following upgrades:

  • OpenSSL 1.0.1 users should upgrade to 1.0.1j.
  • OpenSSL 1.0.0 users should upgrade to 1.0.0o.
  • OpenSSL 0.9.8 users should upgrade to 0.9.8zc.



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