Auth bypass in Openafs
CVE-2018-16947
An issue was discovered in OpenAFS before 1.6.23 and 1.8.x before 1.8.2. The backup tape controller (butc) process accepts incoming RPCs but does not require (or allow for) authentication of those RPCs. Handling those RPCs results in operations being performed with administrator credentials, including dumping/restoring volume contents and manipulating the backup database. For example, an unauthenticated attacker can replace any volume's content with arbitrary data.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.026 (84.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000
Affected products
- Openafs
- Debian Linux — versions 8.0, 9.0
Weakness classification (CWE)
References
- openafs.org/pages/security/OPENAFS-SA-2018-001.txt (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2018/09/msg00024.html (mailing-list, Third Party Advisory)
- www.debian.org/security/2018/dsa-4302 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-16947?
- CVE-2018-16947 is a critical-severity vulnerability in Openafs, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-09-12.
- How severe is CVE-2018-16947?
- Critical severity. CVSS v3 base score is 9.8 out of 10.