Another Critical Flaw in Drupal Discovered — Update Your Site ASAP!

Feb 21, 2019

Developers of Drupal—a popular open-source content management
system software that powers millions of websites—have released the
latest version of their software to patch a critical vulnerability
that could allow remote attackers to hack your site.

The update came two days after the Drupal security team released
an advance security notification ^[1]
of the upcoming patches, giving websites administrators early
heads-up to fix their websites before hackers abuse the
loophole.

The vulnerability in question is a critical remote code
execution (RCE) flaw in Drupal Core that could “lead to arbitrary
PHP code execution in some cases,” the Drupal security team
said.

While the Drupal team hasn’t released any technical details of the
vulnerability (CVE-2019-6340), it mentioned that the flaw resides
due to the fact that some field types do not properly sanitize data
from non-form sources and affects Drupal 7 and 8 Core.

It should also be noted that your Drupal-based website is only
affected if the RESTful Web Services (rest) module is enabled and
allows PATCH or POST requests, or it has another web services
module enabled.

If you can’t immediately install the latest update, then you can
mitigate the vulnerability by simply disabling all web services
modules, or configuring your web server(s) to not allow
PUT/PATCH/POST requests to web services resources.

“Note that web services resources may be available on multiple
paths depending on the configuration of your server(s),” Drupal
warns in its security advisory ^[2]
published Wednesday.

“For Drupal 7, resources are for example typically available via
paths (clean URLs) and via arguments to the “q” query argument. For
Drupal 8, paths may still function when prefixed with
index.php/.”

However, considering the popularity of Drupal exploits among
hackers, you are highly recommended to install the latest update:

If you are using Drupal 8.6.x, upgrade your website to Drupal
8.6.10.
If you are using Drupal 8.5.x or earlier, upgrade your website
to Drupal 8.5.11

Drupal also said that the Drupal 7 Services module itself does
not require an update at this moment, but users should still
consider applying other contributed updates associated with the
latest advisory if “Services” is in use.

Drupal has credited Samuel Mortenson of its security team to
discover and report the vulnerability.

References

^{^}
security notification
(www.drupal.org)
^{^}
advisory
(www.drupal.org)

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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.

Another Critical Flaw in Drupal Discovered — Update Your Site ASAP!

References

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