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.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2:3.98-0ubuntu0.20.04.1", "binary_name": "libnss3" }, { "binary_version": "2:3.98-0ubuntu0.20.04.1", "binary_name": "libnss3-dbgsym" }, { "binary_version": "2:3.98-0ubuntu0.20.04.1", "binary_name": "libnss3-dev" }, { "binary_version": "2:3.98-0ubuntu0.20.04.1", "binary_name": "libnss3-tools" }, { "binary_version": "2:3.98-0ubuntu0.20.04.1", "binary_name": "libnss3-tools-dbgsym" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2:3.68.2-0ubuntu1.2", "binary_name": "libnss3" }, { "binary_version": "2:3.68.2-0ubuntu1.2", "binary_name": "libnss3-dbgsym" }, { "binary_version": "2:3.68.2-0ubuntu1.2", "binary_name": "libnss3-dev" }, { "binary_version": "2:3.68.2-0ubuntu1.2", "binary_name": "libnss3-tools" }, { "binary_version": "2:3.68.2-0ubuntu1.2", "binary_name": "libnss3-tools-dbgsym" } ] }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2:3.92-1", "binary_name": "libnss3" }, { "binary_version": "2:3.92-1", "binary_name": "libnss3-dbgsym" }, { "binary_version": "2:3.92-1", "binary_name": "libnss3-dev" }, { "binary_version": "2:3.92-1", "binary_name": "libnss3-tools" }, { "binary_version": "2:3.92-1", "binary_name": "libnss3-tools-dbgsym" } ] }