Arbitrary file upload in Monstra

CVE-2017-18048

Monstra CMS 3.0.4 allows users to upload arbitrary files, which leads to remote command execution on the server, for example because .php (lowercase) is blocked but .PHP (uppercase) is not.

Vulnerability class: Unrestricted File Upload

EPSS: 0.634 (99.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

  • Monstra — versions 3.0.4
  • N/a — versions n/a

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
  • cve@mitre.org (Exploit, VDB Entry, Third Party Advisory, exploit, x_refsource_EXPLOIT-DB)
  • cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
  • cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2017-18048?
CVE-2017-18048 is a high-severity vulnerability in Monstra, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2018-01-23.
How severe is CVE-2017-18048?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2017-18048 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.