DEBIAN-CVE-2023-4421
Record from OSV · Published December 12, 2023
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| nss | Debian:12 | 2:3.61-1 |
| nss | Debian:14 | 2:3.61-1 |
| nss | Debian:13 | 2:3.61-1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | nss | 0 |
| Debian:14 | nss | 0 |
| Debian:13 | nss | 0 |
Timeline
- Dec 12, 2023 CVE Published
- Oct 26, 2026 CVE Updated
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