CVE-2021-20305
Description
A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-20305
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2021:1206
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-20305.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 3.7.2-1 | |
| sles | affected | | |
| rocky | 8 | fixed | |
| debian | bookworm | fixed | 3.7.2-1 |
| debian | bullseye | fixed | 3.7.2-1 |
| debian | forky | fixed | 3.7.2-1 |
| debian | sid | fixed | 3.7.2-1 |
| debian | trixie | fixed | 3.7.2-1 |
References
Verify integrity in audit chain (admin only). AS-IS.