Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0ycTg5LTQ4NWMtOWoyeM4AAzSj

Improper random reading in CIRCL

Impact

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.

Patches

The fix was introduced in CIRCL v. 1.3.3

Permalink: https://github.com/advisories/GHSA-2q89-485c-9j2x
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0ycTg5LTQ4NWMtOWoyeM4AAzSj
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 1 year ago
Updated: about 1 year ago

CVSS Score: 5.3
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N

EPSS Percentage: 0.00057
EPSS Percentile: 0.2526

Identifiers: GHSA-2q89-485c-9j2x, CVE-2023-1732
References:

• https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x
• https://nvd.nist.gov/vuln/detail/CVE-2023-1732
• https://github.com/cloudflare/circl/commit/ff8d91225f8954b4970b6d6382d2e4c78f4a4cf8
• https://github.com/cloudflare/circl/releases/tag/v1.3.3
• https://github.com/advisories/GHSA-2q89-485c-9j2x

Repository: https://github.com/cloudflare/circl
Blast Radius: 18.3

Affected Packages