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4.7
Firefox signatures could reveal private keys
published 5 days ago
Summary
Firefox's code for creating digital signatures was changed, causing the time it takes to sign data to vary based on secret information. This timing difference can allow an attacker to guess the private key used for signing. Apply the latest Firefox update or patch to restore the protective timing protection.
What to do
- Update cleanstart firefox to version 80.0-r0.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | firefox |
< 80.0-r0 Fix: upgrade to 80.0-r0
|
Original advisory text
During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data
Security vulnerability affects the firefox package. During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data.
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker partial control (estimated)
Timeline
Published30 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2024-ZR75651 · OSV
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