Auth bypass in Curveball A12n-Server
CVE-2021-29452
a12n-server is an npm package which aims to provide a simple authentication system. A new HAL-Form was added to allow editing users in version 0.18.0. This feature should only have been accessible to admins. Unfortunately, privileges were incorrectly checked allowing any logged in user to make this change. Patched in v0.18.2.
Vulnerability class: Privilege Escalation
EPSS: 0.008 (52.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Curveball A12n-server — versions >= 0.18 < 0.18.2
- Curveballjs A12n-server
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-29452?
- CVE-2021-29452 is a high-severity vulnerability in Curveball A12n-Server, classified under Improper Privilege Management. CVSS score: 8.1/10. Published 2021-04-16.
- How severe is CVE-2021-29452?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2021-29452 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.