CVE-2022-4304 — Timing Oracle in RSA Decryption

Affected: OpenSSL

A timing based side channel exists in the OpenSSL RSA Decryption implementation which could be sufficient to recover a plaintext across a network in a Bleichenbacher style attack. To achieve a successful decryption an attacker would have to be able to send a very large number of trial messages for decryption. The vulnerability affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP and RSASVE.

For example, in a TLS connection, RSA is commonly used by a client to send an encrypted pre-master secret to the server. An attacker that had observed a genuine connection between a client and a server could use this flaw to send trial messages to the server and record the time taken to process them. After a sufficiently large number of messages the attacker could recover the pre-master secret used for the original connection and thus be able to decrypt the application data sent over that connection.

USN-5844-1 — openssl vulnerabilities

Affected: Ubuntu:18.04:LTS: openssl, Ubuntu:20.04:LTS: openssl, Ubuntu:22.04:LTS: openssl

David Benjamin discovered that OpenSSL incorrectly handled X.400 address processing. A remote attacker could possibly use this issue to read arbitrary memory contents or cause OpenSSL to crash, resulting in a denial of service. (CVE-2023-0286)

Corey Bonnell discovered that OpenSSL incorrectly handled X.509 certificate verification. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 22.10. (CVE-2022-4203)

Hubert Kario discovered that OpenSSL had a timing based side channel in the OpenSSL RSA Decryption implementation. A remote attacker could possibly use this issue to recover sensitive information. (CVE-2022-4304)

Dawei Wang discovered that OpenSSL incorrectly handled parsing certain PEM data. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2022-4450)

Octavio Galland and Marcel Böhme discovered that OpenSSL incorrectly handled streaming ASN.1 data. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-0215)

Marc Schönefeld discovered that OpenSSL incorrectly handled malformed PKCS7 data. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 22.10. (CVE-2023-0216)

Kurt Roeckx discovered that OpenSSL i…

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CVE-2022-4304 — Timing Oracle in RSA Decryption

USN-5844-1 — openssl vulnerabilities