K23196136: OpenSSL vulnerability CVE-2016-0800

Security Advisory Description The SSLv2 protocol, as used in OpenSSL before 1.0.1s and 1.0.2 before 1.0.2g and other products, requires a server to send a ServerVerify message before establishing that a client possesses certain plaintext RSA data, which makes it easier for remote attackers to...

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large amount of specially crafted messages to the vulnerable server. By recovering the secret from the ClientKeyExchange message the attacker would be able to decrypt the application data exchanged over that connection.

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The SSLv2 protocol, as used in OpenSSL before 1.0.1s and 1.0.2 before 1.0.2g and other products, requires a server to send a ServerVerify message before establishing that a client possesses certain plaintext RSA data, which makes it easier for remote attackers to decrypt TLS ciphertext data by...

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Timing Attack

openssl is vulnerable to Timing Attack. The vulnerability exists in rsa/rsaossl.c because an attacker can recover ciphertext with a Bleichenbacher style attack by sending a large number of trial messages...

GnuTLS -- timing sidechannel in RSA decryption

The GnuTLS project reports: A vulnerability was found that the response times to malformed RSA ciphertexts in ClientKeyExchange differ from response times of ciphertexts with correct PKCS1 v1.5 padding. Only TLS ciphertext processing is affected...

Information Disclosure

github.com/aws/aws-sdk-go is vulnerable to information disclosure. The library sends an unencrypted hash of the plaintext alongside the ciphertext as a metadata field which could be used to brute force the plaintext, when the hash is readable to the attacker...

GHSA-6JVC-Q2X7-PCHV AWS S3 Crypto SDK sends an unencrypted hash of the plaintext alongside the ciphertext as a metadata field

The AWS S3 Crypto SDK sends an unencrypted hash of the plaintext alongside the ciphertext as a metadata field. This hash can be used to brute force the plaintext, if the hash is readable to the attacker. AWS now blocks this metadata field, but older SDK versions still send it...