GHSA-9763-4f94-gfch CIRCL's Kyber: timing side-channel (kyberslash2)
An attacker can potentially recover secret keys by timing decapsulation of forged ciphertexts in the Go Kyber library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-9763-4f94-gfch?
GHSA-9763-4f94-gfch is a vulnerability in github.com/cloudflare/circl, published on 8 Jan 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Impact
On some platforms, when an attacker can time decapsulation of Kyber on forged cipher texts, they could possibly learn (parts of) the secret key.
Does not apply to ephemeral usage, such as when used in the regular way in TLS.
Patches
Patched in 1.3.7.
References
Which versions are affected by GHSA-9763-4f94-gfch?
3 open source packages ship an affected version, including github.com/cloudflare/circl.
| Package | Affected | Fixed in |
|---|---|---|
github.com/cloudflare/circl Go | All versions | 1.3.7 |
github.com/cloudflare/circl Go | All versions | 1.3.7 |
github.com/cloudflare/circl Go | All versions | 1.3.7 |
How do I fix GHSA-9763-4f94-gfch?
Upgrade github.com/cloudflare/circl to 1.3.7 or later.
Is GHSA-9763-4f94-gfch being exploited?
There is no known exploitation of GHSA-9763-4f94-gfch in the wild and no public exploit code.
Sources
Also known as GO-2024-2453.