Very High
vBulletin 5 Connect 5.1.2 through 5.1.9 PHP object injection attack
CVE ID
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Very High
(2 users assessed)
Very High
(2 users assessed)Unknown
Unknown
Unknown
vBulletin 5 Connect 5.1.2 through 5.1.9 PHP object injection attack
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
The vB_Api_Hook::decodeArguments method in vBulletin 5 Connect 5.1.2 through 5.1.9 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via a crafted serialized object in the arguments parameter to ajax/api/hook/decodeArguments.
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Ratings
-
Attacker ValueVery High
-
ExploitabilityVery High
Technical Analysis
As the world’s most popular forum software, this is a big target, and that this vulnerability was an 0-day when it was first found is also extremely useful as an attacker. When exploited, the vulnerability allows an attacker to execute PHP code on any vBulletin server without requiring user authentication. It works with the default installation, meaning every vBulletin site was vulnerable at one point.
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Technical Analysis
https://seclists.org/fulldisclosure/2019/Sep/31 appears to leverage the same RCE technique used in https://blog.checkpoint.com/2015/11/05/check-point-discovers-critical-vbulletin-0-day/ (this CVE).
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Additional Info
Technical Analysis
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CVE ID
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