Critical Firefox 0-Day Under Active Attacks – Update Your Browser Now!

Jan 9, 2020

Attention! Are you using Firefox as your web browsing software
on your Windows, Linux, or Mac systems?

If yes, you should immediately update your free and open-source
Firefox web browser to the latest version available on Mozilla’s
website.

Why the urgency? Mozilla earlier today released Firefox
72.0.1 and Firefox ESR 68.4.1 versions to patch a
critical zero-day vulnerability in its browsing software that an
undisclosed group of hackers is actively exploiting in the
wild.

Tracked as ‘CVE-2019-17026,’ the bug is a critical ‘type
confusion vulnerability’ that resides in the IonMonkey just-in-time
(JIT) compiler of the Mozilla’s JavaScript engine SpiderMonkey.

In general, a type confusion vulnerability occurs when the code
doesn’t verify what objects it is passed to and blindly uses it
without checking its type, allowing attackers to crash the
application or achieve code execution.

Without revealing details about the security flaw and any details
on the ongoing potential cyberattacks, Mozilla said ^[1], “incorrect alias
information in IonMonkey JIT compiler for setting array elements
could lead to type confusion.”

That means, the issue in the vulnerable JavaScript engine
component can be exploited by a remote attacker just by tricking an
unsuspecting user into visiting a maliciously crafted web page to
execute arbitrary code on the system within the context of the
application.

The vulnerability was reported to Mozilla by cybersecurity
researchers at Qihoo 360 ATA, who has also not yet released any
information about their investigation, findings, and exploit.

Though Firefox, by default, automatically installs updates when
they are available and activate a new version after a restart, you
can always do a manual update using the built-in functionality by
navigating to Menu > Help > About Mozilla Firefox.

References

^{^}
said
(www.mozilla.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.

Critical Firefox 0-Day Under Active Attacks – Update Your Browser Now!

References

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