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Flaw in F5 Products Allows Recovery of Encrypted Data

A crypto vulnerability affecting some F5 Networks products can be exploited by a remote attacker for recovering encrypted data and launching man-in-the-middle (MitM) attacks, the company told customers on Friday.

The impacted products are part of F5’s BIG-IP application delivery platform, including security, traffic management and performance services such as LTM, AAM, AFM, Analytics, APM, ASM, DNS, GTM, Link Controller, and PEM. The flaw also affects the F5 WebSafe anti-fraud solution.

According to F5, the vulnerability exposes virtual servers configured with a Client SSL profile and RSA key exchange enabled to adaptive chosen-ciphertext attacks, also known as Bleichenbacher attacks. Launching an attack against a TLS session established using an RSA key exchange allows a remote hacker to recover plaintext data and launch MitM attacks, even if they don’t have access to the server’s private key.

Nick Sullivan, cryptography expert at Cloudflare, pointed out that the...(continued)

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