Firefox Releases Critical Patch Update to Stop Ongoing Zero-Day Attacks

Jun 18, 2019

If you use the Firefox web browser, you need to update it
right now.

Mozilla earlier today released Firefox 67.0.3 and Firefox ESR
60.7.1 versions to patch a critical zero-day vulnerability in the
browsing software that hackers have been found exploiting in the
wild.

Discovered and reported by Samuel Groß, a cybersecurity
researcher at Google Project Zero, the vulnerability could allow
attackers to remotely execute arbitrary code on machines running
vulnerable Firefox versions and take full control of them.

The vulnerability, identified as CVE-2019-11707, affects
anyone who uses Firefox on desktop (Windows, macOS, and Linux) —
whereas, Firefox for Android, iOS, and Amazon Fire TV are not
affected.

According to an advisory ^[1], the flaw has been
labeled as a type confusion vulnerability in Firefox that can
result in an exploitable crash due to issues in Array.pop which can
occur when manipulating JavaScript objects.

At the time of writing, neither the researcher nor Mozilla has
yet released any further technical details or proof-of-concept for
this flaw.

Through Firefox automatically installs latest updates and
activate new version after a restart, users are still advised to
ensure they are running the latest Firefox 67.0.3 and Firefox
(Extended Support Release) 60.7.1 or later.

References

^{^}
advisory
(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.

Firefox Releases Critical Patch Update to Stop Ongoing Zero-Day Attacks

References

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