Vulnerability · Published May 10, 2023 · Assigned by cloudflare
CVE-2023-1732Improper random reading in CIRCL
Medium 5.3
In plain English
A medium-severity improper input validation in CIRCL from Cloudflare. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. In rare deployment cases (error thrown by the Read() function), this could lead to a predictable shared secret. The tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides crypto/rand.Reader, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/cloudflare/circl | 1.3.3 | GHSA-2q89-485c-9j2x |
| Go | github.com/cloudflare/circl | 1.3.3 | GO-2023-1765 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cloudflare | CIRCL | 0 – before <1.3.3 |
Weakness: CWE-20, CWE-755 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N