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CVE-2022-1434

Status Candidate

Overview

The OpenSSL 3.0 implementation of the RC4-MD5 ciphersuite incorrectly uses the AAD data as the MAC key. This makes the MAC key trivially predictable. An attacker could exploit this issue by performing a man-in-the-middle attack to modify data being sent from one endpoint to an OpenSSL 3.0 recipient such that the modified data would still pass the MAC integrity check. Note that data sent from an OpenSSL 3.0 endpoint to a non-OpenSSL 3.0 endpoint will always be rejected by the recipient and the connection will fail at that point. Many application protocols require data to be sent from the client to the server first. Therefore, in such a case, only an OpenSSL 3.0 server would be impacted when talking to a non-OpenSSL 3.0 client. If both endpoints are OpenSSL 3.0 then the attacker could modify data being sent in both directions. In this case both clients and servers could be affected, regardless of the application protocol. Note that in the absence of an attacker this bug means that an OpenSSL 3.0 endpoint communicating with a non-OpenSSL 3.0 endpoint will fail to complete the handshake when using this ciphersuite. The confidentiality of data is not impacted by this issue, i.e. an attacker cannot decrypt data that has been encrypted using this ciphersuite - they can only modify it. In order for this attack to work both endpoints must legitimately negotiate the RC4-MD5 ciphersuite. This ciphersuite is not compiled by default in OpenSSL 3.0, and is not available within the default provider or the default ciphersuite list. This ciphersuite will never be used if TLSv1.3 has been negotiated. In order for an OpenSSL 3.0 endpoint to use this ciphersuite the following must have occurred: 1) OpenSSL must have been compiled with the (non-default) compile time option enable-weak-ssl-ciphers 2) OpenSSL must have had the legacy provider explicitly loaded (either through application code or via configuration) 3) The ciphersuite must have been explicitly added to the ciphersuite list 4) The libssl security level must have been set to 0 (default is 1) 5) A version of SSL/TLS below TLSv1.3 must have been negotiated 6) Both endpoints must negotiate the RC4-MD5 ciphersuite in preference to any others that both endpoints have in common Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2).

Related Files

Ubuntu Security Notice USN-5402-1
Posted May 4, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5402-1 - Elison Niven discovered that OpenSSL incorrectly handled the c_rehash script. A local attacker could possibly use this issue to execute arbitrary commands when c_rehash is run. Raul Metsma discovered that OpenSSL incorrectly verified certain response signing certificates. A remote attacker could possibly use this issue to spoof certain response signing certificates. This issue only affected Ubuntu 22.04 LTS.

tags | advisory, remote, arbitrary, local, spoof
systems | linux, ubuntu
advisories | CVE-2022-1292, CVE-2022-1343, CVE-2022-1434, CVE-2022-1473
SHA-256 | 9f908328ff337686f5d5cffc66667d81dbd3b4ce35629e2bd3050e7444f1fd8b
OpenSSL Toolkit 3.0.3
Posted May 3, 2022
Site openssl.org

OpenSSL is a robust, fully featured Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols with full-strength cryptography world-wide. The 3.x series is the current major version of OpenSSL.

Changes: Fixed a bug in the c_rehash script which was not properly sanitizing shell metacharacters to prevent command injection. Fixed a bug in the function OCSP_basic_verify that verifies the signer certificate on an OCSP response. Fixed a bug where the RC4-MD5 ciphersuite incorrectly used the AAD data as the MAC key. Fixed a bug in the OPENSSL_LH_flush() function that breaks reuse of the memory occupied by the removed hash table entries.
tags | tool, encryption, protocol
systems | unix
advisories | CVE-2022-1292, CVE-2022-1343, CVE-2022-1434, CVE-2022-1473
SHA-256 | ee0078adcef1de5f003c62c80cc96527721609c6f3bb42b7795df31f8b558c0b
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