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CVE-2023-4421

Status Candidate

Overview

The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim's key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS < 3.61.

Related Files

Ubuntu Security Notice USN-6727-2
Posted Apr 12, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6727-2 - USN-6727-1 fixed vulnerabilities in NSS. The update introduced a regression when trying to load security modules on Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. This update fixes the problem. It was discovered that NSS incorrectly handled padding when checking PKCS#1 certificates. A remote attacker could possibly use this issue to perform Bleichenbacher-like attacks and recover private data. This issue only affected Ubuntu 20.04 LTS. It was discovered that NSS had a timing side-channel when performing RSA decryption. A remote attacker could possibly use this issue to recover private data. It was discovered that NSS had a timing side-channel when using certain NIST curves. A remote attacker could possibly use this issue to recover private data. The NSS package contained outdated CA certificates. This update refreshes the NSS package to version 3.98 which includes the latest CA certificate bundle and other security improvements.

tags | advisory, remote, vulnerability
systems | linux, ubuntu
advisories | CVE-2023-4421, CVE-2023-5388, CVE-2023-6135
SHA-256 | 98f7aae4d30d1b37976aae71c2f8f3d1c09fb49865d4abec3139169342e9663a
Ubuntu Security Notice USN-6727-1
Posted Apr 11, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6727-1 - It was discovered that NSS incorrectly handled padding when checking PKCS#1 certificates. A remote attacker could possibly use this issue to perform Bleichenbacher-like attacks and recover private data. This issue only affected Ubuntu 20.04 LTS. It was discovered that NSS had a timing side-channel when performing RSA decryption. A remote attacker could possibly use this issue to recover private data.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2023-4421, CVE-2023-5388, CVE-2023-6135
SHA-256 | 2c691be3dfb8ed61396b4eb86ac7b035f8344a516e272f6ffb13c26ac0186bd9
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