Critical Zero-Day Pre-authentication Remote Code Execution Exploit Published for 5.x Versions of vBulletin
New critical zero-day pre-auth RCE exploit code published on Full Disclosure mailing list for 5.x versions of vBulletin (CVE-2019-16759).
UPDATE 09/25/2019: The background and solution sections below have been updated to reflect the security patch issued by the vBulletin team.
A preauthentication remote code execution (RCE) zero-day exploit was recently disclosed anonymously for vBulletin 5.x. This zero-day does not seem to have followed coordinated disclosure procedures. VBulletin released a new security patch for vBulletin versions 5.5.2, 5.5.3, and 5.5.4.
Tenable Research has analyzed and confirmed that this exploit works on default configurations of vBulletin. Based on the public PoC, an unauthenticated attacker can send a specially crafted HTTP POST request to a vulnerable vBulletin host and execute commands. These commands would be executed with the permissions of the user account that the vBulletin service is utilizing. Depending on the service user’s permissions, this could allow complete control of a host.
Proof of concept
The published exploit code returns its successful execution in a JSON formatted response.
The vBulletin team has issued a patch for CVE-2019-16759 for vBulletin versions 5.5.2, 5.5.3, and 5.5.4. Users on earlier versions of vBulletin 5.x will need to update to one of the currently supported versions in order to apply the patch. VBulletin cloud users don’t need to perform any additional actions as the fix has already been applied to the cloud version.
Identifizieren betroffener Systeme
A list of Tenable plugins to identify this vulnerability will appear here as they’re released.
Verfolgen Sie die Beiträge des Security Response Team von Tenable in der Tenable Community.
Erfahren Sie mehr über Tenable, die erste Cyber Exposure-Plattform für die ganzheitliche Verwaltung Ihrer modernen Angriffsoberfläche.
Get a free 60-day trial of Tenable.io Vulnerability Management.
Sind Sie durch die neuesten Exploits gefährdet?
Geben Sie Ihre E-Mail-Adresse ein, um die neuesten Warnmeldungen zu Cyberrisiken in Ihrem Posteingang zu erhalten.