Deserialization in Vbulletin
CVE-2017-17672
In vBulletin through 5.3.x, there is an unauthenticated deserialization vulnerability that leads to arbitrary file deletion and, under certain circumstances, code execution, because of unsafe usage of PHP's unserialize() in vB_Library_Template's cacheTemplates() function, which is a publicly exposed API. This is exploited with the templateidlist parameter to ajax/api/template/cacheTemplates.
Vulnerability class: Insecure Deserialization
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: 0.152 (96.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.152 · newest: 0.152 · change: 0.000
Affected products
- Vbulletin — versions 5.0.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.exploit-db.com/exploits/43362/ (Exploit, VDB Entry, Third Party Advisory, exploit)
- blogs.securiteam.com/index.php/archives/3573 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-17672?
- CVE-2017-17672 is a critical-severity vulnerability in Vbulletin, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2017-12-14.
- How severe is CVE-2017-17672?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2017-17672 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.