[Unpatched] Critical 0-Day RCE Exploit for vBulletin Forum Disclosed Publicly

Sep 24, 2019

An anonymous hacker today publicly revealed details and
proof-of-concept exploit code for an unpatched, critical zero-day
remote code execution vulnerability in vBulletin—one of the widely
used internet forum software.

One of the reasons why the vulnerability should be viewed as a
severe issue is not just because it is remotely exploitable, but
also doesn’t require authentication.

Written in PHP, vBulletin is a widely used proprietary Internet
forum software package that powers more than 100,000 websites on
the Internet, including Fortune 500 and Alexa Top 1 million
companies websites and forums.

According to details published on the
Full Disclosure mailing list, the hacker claims to have found a
remote code execution vulnerability that appears to affect
vBulletin versions 5.0.0 till the latest 5.5.4.
^[1]

The vulnerability resides in the way an internal widget file of the
forum software package accepts configurations via the URL
parameters and then parse them on the server without proper safety
checks, allowing attackers to inject commands and remotely execute
code on the system.

As a proof-of-concept, the hacker has also released a python-based
exploit that could make it easier for anyone to exploit the
zero-day in the wild.

So far, the Common Vulnerabilities and Exposures (CVE) number
has not been assigned to the vulnerability.

The Hacker News has also informed vBulletin project maintainers
about the vulnerability disclosure and expect them to patch the
security issue before hackers started exploiting them to target
vBulletin installations.

References

^{^}
published
(seclists.org)

The Hacker News Headlines

New Apple iOS 16 Exploit Enables Stealthy Cellular Access Under Fake Airplane Mode

Aug 18, 2023

The Hacker News Headlines

China-Linked Bronze Starlight Group Targeting Gambling Sector with Cobalt Strike Beacons

Aug 18, 2023

The Hacker News Headlines

NoFilter Attack: Sneaky Privilege Escalation Method Bypasses Windows Security

Aug 18, 2023

OWASP TOP !0

Injection. Injection flaws, such as SQL, NoSQL, OS, and LDAP injection, occur when untrusted data is sent to an interpreter as part of a command or query. The attacker’s hostile data can trick the interpreter into executing unintended commands or accessing data without proper authorization. Broken Authentication. Application functions related to authentication and session management are often implemented incorrectly, allowing attackers to compromise passwords, keys, or session tokens, or to exploit other implementation flaws to assume other users’ identities temporarily or permanently. Sensitive Data Exposure. Many web applications and APIs do not properly protect sensitive data, such as financial, healthcare, and PII. Attackers may steal or modify such weakly protected data to conduct credit card fraud, identity theft, or other crimes. Sensitive data may be compromised without extra protection, such as encryption at rest or in transit, and requires special precautions when exchanged with the browser. XML External Entities (XXE). Many older or poorly configured XML processors evaluate external entity references within XML documents. External entities can be used to disclose internal files using the file URI handler, internal file shares, internal port scanning, remote code execution, and denial of service attacks. Broken Access Control. Restrictions on what authenticated users are allowed to do are often not properly enforced. Attackers can exploit these flaws to access unauthorized functionality and/or data, such as access other users’ accounts, view sensitive files, modify other users’ data, change access rights, etc. Security Misconfiguration. Security misconfiguration is the most commonly seen issue. This is commonly a result of insecure default configurations, incomplete or ad hoc configurations, open cloud storage, misconfigured HTTP headers, and verbose error messages containing sensitive information. Not only must all operating systems, frameworks, libraries, and applications be securely configured, but they must be patched/upgraded in a timely fashion. Cross-Site Scripting XSS. XSS flaws occur whenever an application includes untrusted data in a new web page without proper validation or escaping, or updates an existing web page with user-supplied data using a browser API that can create HTML or JavaScript. XSS allows attackers to execute scripts in the victim’s browser which can hijack user sessions, deface web sites, or redirect the user to malicious sites. Insecure Deserialization. Insecure deserialization often leads to remote code execution. Even if deserialization flaws do not result in remote code execution, they can be used to perform attacks, including replay attacks, injection attacks, and privilege escalation attacks. Using Components with Known Vulnerabilities. Components, such as libraries, frameworks, and other software modules, run with the same privileges as the application. If a vulnerable component is exploited, such an attack can facilitate serious data loss or server takeover. Applications and APIs using components with known vulnerabilities may undermine application defenses and enable various attacks and impacts. Insufficient Logging & Monitoring. Insufficient logging and monitoring, coupled with missing or ineffective integration with incident response, allows attackers to further attack systems, maintain persistence, pivot to more systems, and tamper, extract, or destroy data. Most breach studies show time to detect a breach is over 200 days, typically detected by external parties rather than internal processes or monitoring.

[Unpatched] Critical 0-Day RCE Exploit for vBulletin Forum Disclosed Publicly

References

Related Post

New Apple iOS 16 Exploit Enables Stealthy Cellular Access Under Fake Airplane Mode

China-Linked Bronze Starlight Group Targeting Gambling Sector with Cobalt Strike Beacons

NoFilter Attack: Sneaky Privilege Escalation Method Bypasses Windows Security

You missed

Protected: Rotary VI EAST

Protected: BetterCyberCareer Group

Protected: Benin Club 1931 – Official

Protected: Whatsapp AI Automation Group