CERT-In Emergency Alert: Critical Chrome & GitLab RCE Vulnerabilities Exploitable Now – Patch Immediately

FROM: The BC Threat Intelligence Group
TO: Enterprise CISOs, Security Operations Centers, IT Leadership
DATE: November 2, 2025
SUBJECT: CERT-In Critical Alert: Chrome & GitLab RCE Vulnerabilities – Your Immediate Response Checklist

1.0 EXECUTIVE SUMMARY: LEVEL-5 CRITICAL ALERT

At 14:30 IST on November 2, 2025, the Indian Computer Emergency Response Team (CERT-In) issued an emergency cybersecurity directive concerning multiple critical vulnerabilities in Google Chrome and GitLab. These flaws permit remote code execution (RCE) without authentication, representing a severe and immediate threat to enterprise security. This is not a routine alert; it signals an active, exploitable threat that requires your immediate attention.

What makes this alert different is the attack chaining potential. Analysis from the Broad Channel Strategic Forensics Division indicates that these are not isolated flaws. They are components of a sophisticated attack chain that allows a threat actor to move from a simple browser exploit on a single endpoint to a full-scale compromise of your software supply chain. The low attack complexity and lack of required user authentication mean that unpatched systems are not just vulnerable; they are ticking time bombs.

This is a “drop everything and patch now” event. The problem your organization faces is not just a vulnerable browser; it’s a direct threat to your intellectual property and customer trust. This directive provides the immediate, actionable checklist your organization must execute to neutralize this threat.

Visual Requirement: A high-contrast, red-and-black themed image. On the left, the Google Chrome logo is shown cracking, with red binary code spilling out. On the right, the GitLab logo is similarly fractured. In the center, a large, red, hexagonal “STOP” sign icon with the text “URGENT: PATCH NOW” is prominently displayed.

2.0 THREAT PROFILE: The Chrome & GitLab Vulnerabilities

The CERT-In alert covers a range of high-severity flaws. While the list of CVEs is long, the core problem is the synergistic effect they produce.

Google Chrome Vulnerabilities (The Entry Point):
The Chrome vulnerabilities are a cluster of memory-related flaws, primarily targeting the V8 JavaScript engine. The problem for your organization is that every employee’s browser is now a potential gateway into your network.

• Core Issue: Flaws like Type Confusion in V8 and Use-After-Free vulnerabilities allow an attacker to craft a malicious website that, when visited, executes code on the victim’s machine. The user does not need to download anything or click any suspicious buttons. The act of visiting the page is enough.

GitLab Vulnerabilities (The Crown Jewels):
The GitLab flaw stems from an improper access control issue affecting both Community (CE) and Enterprise (EE) editions. The problem this creates is that once an attacker has a foothold on your network (e.g., by compromising a developer’s machine via the Chrome exploit), they can bypass security restrictions to gain control of your source code.

Vulnerability Attribute	Threat Assessment	Strategic Problem
Primary Impact	Remote Code Execution (RCE)	An attacker can run any command they want on your systems.
Authentication	None Required	The attack can be initiated by an external actor with no credentials.
Attack Complexity	Low	The exploit code is likely simple and will be commoditized quickly.
Exploitation Status	Imminent or Active	You must assume attackers are already scanning for vulnerable systems.

3.0 PREDICTIVE ANALYSIS: The Supply Chain Nightmare Scenario

The true danger of this alert is not the individual vulnerabilities but how they can be chained together. This is the scenario that our threat intelligence unit has modeled and assesses as a high-probability attack vector.

• The Problem: Your developers are your most privileged users. Compromising one gives an attacker the keys to the kingdom.
  • Stage 1 (Initial Access): An attacker registers a domain that looks like a legitimate developer resource (e.g., stack-overflow-solutions[.]com). They host a webpage containing the Chrome V8 exploit. A targeted email is sent to your development team with a link to this page, disguised as a solution to a common coding problem.
  • Stage 2 (Endpoint Compromise): A developer, working to solve a problem, clicks the link. The Chrome RCE vulnerability is triggered. The attacker now has a shell on the developer’s machine, inside your corporate network.
  • Stage 3 (Source Code Compromise): From the compromised machine, the attacker uses the developer’s cached credentials to access your GitLab server. They exploit the GitLab security vulnerability to gain elevated privileges.
  • Stage 4 (Weaponization): The attacker subtly injects a backdoor into the source code of your flagship product. This is not a noisy ransomware attack; it’s a silent, malicious implant. Our guide to malware analysis techniques details how such backdoors operate.
  • Stage 5 (Supply Chain Catastrophe): Your normal CI/CD pipeline builds, signs, and deploys the compromised software update to your entire customer base. Your company has now become the distribution channel for a widespread malware campaign.

This attack chain transforms a simple browser vulnerability into a catastrophic supply chain compromise. Your biggest problem is no longer data theft; it’s the reputational and legal fallout of having infected your own customers.

4.0 IMMEDIATE ACTION PLAN: Your 4-Hour Response Window

This is not a drill. The following actions must be your organization’s sole focus until completed. This is the core of our emergency patch management protocol.

Action 1: Immediate Asset Discovery (30 Minutes)

You cannot patch what you don’t know you have. The problem of “shadow IT” means you likely have more instances of these applications than you think.

• Task: Use your asset management tools and run a network scan to generate a live inventory of all Google Chrome installations and GitLab instances. Do not rely on old data. Our Free Online Port Scanner can help identify running services you may not be aware of.
• Output: A simple, prioritized spreadsheet of all vulnerable assets. Label them: “Critical-Production,” “Staging,” “Development,” etc.

Action 2: Force-Patch All Chrome Browsers (1 Hour)

Every unpatched browser is an open door into your network. Your problem is closing them all, simultaneously.

• Task: Use your MDM (e.g., Microsoft Intune) to push the latest Chrome update to all managed devices. Set a mandatory installation deadline of one hour.
• Task: For unmanaged devices, send an emergency, multi-channel communication (email, Slack, SMS) instructing users to update immediately. Explain that this is a critical, non-negotiable security requirement.
• Verification: The required patched version is in the CERT-In advisory. Your goal is 100% compliance.

Action 3: Patch All GitLab Instances (1-2 Hours)

Your source code is your most valuable asset. The problem is that patching a critical production system is risky, but not patching is riskier.

• Task (Critical): First, apply the patch to a non-production staging environment. Have a developer test the core functionality (e.g., a test commit, merge request). Allocate no more than 30 minutes for this. If the patch breaks the build, you have a bigger problem, but you must know now.
• Task: Once verified, apply the patch to your production GitLab servers. For detailed guidance on this high-pressure process, refer to our guide on fixing unpatched vulnerabilities.

Action 4: Isolate and Restrict Access (During Patching)

Assume you are already under attack. Your problem is containing the potential blast radius.

• Task: During the GitLab patching window, place your instances behind a maintenance page. This severs any active malicious connections.
• Task: At the firewall, create a temporary rule blocking all external access to your GitLab servers. Only allow access from your corporate VPN, which should require MFA. Our Firewall Log Analyzer can help you identify and block suspicious IPs.

5.0 SECONDARY ACTIONS: Hunting for Intruders (The Next 6 Hours)

Once patching is complete, your problem shifts from prevention to detection. Have they already gotten in?

• Hunt for Indicators of Compromise (IOCs): This is not a passive activity. Your security team needs to actively hunt. Review your firewall, web proxy, and GitLab audit logs for the specific IOCs published by CERT-In. Look for any unauthorized code commits or access from unusual IP addresses.
• Analyze Network Traffic: The problem with sophisticated attackers is that their traffic can look legitimate. Use your EDR and network analysis tools to look for anomalies. Is a developer’s machine making an unusual outbound connection to a residential IP address in another country? That’s a red flag.
• Verify Your “Get Out of Jail Free” Card: Your backups are your last line of defense. The problem is, most companies don’t test their restore process until it’s too late. Task your infrastructure team with restoring a recent GitLab backup to a test server now. If it fails, you have a much bigger problem. A robust backup strategy is the core of our Complete Ransomware Survival Guide.

Strategic Takeaway: “In the face of a zero-day threat, your response speed is your only defense. The delta between ‘patch available’ and ‘patch deployed’ is the window where attackers live. Your goal must be to shrink that window to minutes, not days.”

6.0 CONCLUSION: ACT NOW

The CERT-In emergency alert for the Chrome RCE vulnerability and the GitLab security vulnerability is the clearest possible signal of an active and present danger. The combination of remote code execution, zero authentication requirement, and low attack complexity means that widespread exploitation is not a matter of “if,” but “when.”

Your priority today is clear: execute this emergency patch management checklist without delay. The security of your organization’s intellectual property and the integrity of your software supply chain depend on the actions you take in the next few hours.

The BC Threat Intelligence Group