Description
Hikka is a Telegram userbot. A vulnerability affects all users of versions below 1.6.2, including most of the forks. It allows an unauthenticated attacker to gain access to Telegram account of a victim, as well as full access to the server. The issue is patched in version 1.6.2. No known workarounds are available.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-19067
1. Vulnerability Assessment and Severity Evaluation
The vulnerability in Hikka, a Telegram userbot, is severe and affects all versions below 1.6.2, including most forks. The CVSS (Common Vulnerability Scoring System) base score of 9.7 indicates a critical vulnerability. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H breaks down as follows:
- Attack Vector (AV:N): Network, meaning the vulnerability can be exploited remotely.
- Attack Complexity (AC:L): Low, indicating that the attack is relatively simple to execute.
- Privileges Required (PR:N): None, meaning no special privileges are needed to exploit the vulnerability.
- User Interaction (UI:R): Required, suggesting that some form of user interaction is necessary for the exploit to succeed.
- Scope (S:C): Changed, indicating that the vulnerability affects a component outside the security scope of the vulnerable component.
- Confidentiality (C:H): High, meaning the vulnerability can result in a complete loss of confidentiality.
- Integrity (I:H): High, indicating a complete loss of integrity.
- Availability (A:H): High, suggesting a complete loss of availability.
Given these factors, the vulnerability is highly critical and poses a significant risk to users.
2. Potential Attack Vectors and Exploitation Methods
The vulnerability allows an unauthenticated attacker to gain access to a victim's Telegram account and full access to the server. Potential attack vectors include:
- Phishing Attacks: Tricking users into interacting with malicious content that exploits the vulnerability.
- Malicious Links: Distributing links that, when clicked, trigger the exploit.
- Social Engineering: Manipulating users into performing actions that enable the exploit.
Exploitation methods could involve sending specially crafted messages or commands to the userbot, which then executes malicious code, granting the attacker access to the Telegram account and server.
3. Affected Systems and Software Versions
All versions of Hikka below 1.6.2 are affected, including most forks. This means any user running an older version of Hikka is at risk. The vulnerability is patched in version 1.6.2, so users should upgrade immediately.
4. Recommended Mitigation Strategies
- Immediate Upgrade: Users should upgrade to Hikka version 1.6.2 or later to mitigate the risk.
- User Education: Inform users about the risks of interacting with unknown or suspicious content.
- Network Monitoring: Implement monitoring to detect unusual activity that may indicate an exploit attempt.
- Access Controls: Enforce strict access controls and authentication mechanisms to limit the impact of potential exploits.
- Regular Audits: Conduct regular security audits to identify and address vulnerabilities promptly.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant threat to European users of Hikka and Telegram. Given the widespread use of Telegram in Europe, the potential for large-scale data breaches and unauthorized access to personal information is high. This could lead to:
- Data Breaches: Unauthorized access to sensitive information.
- Reputation Damage: Loss of trust in Telegram and related services.
- Regulatory Concerns: Potential violations of GDPR and other data protection regulations.
6. Technical Details for Security Professionals
- Vulnerability Type: Likely a remote code execution (RCE) or authentication bypass vulnerability.
- Exploit Mechanism: The attacker sends a specially crafted message or command to the userbot, which then executes malicious code.
- Detection: Monitor for unusual network traffic patterns, unauthorized access attempts, and anomalous userbot behavior.
- Patch Analysis: Review the patch in the GitHub commit
9a0e4b1b387ef828c345c43d990421d5afcff5f6to understand the specific changes made to mitigate the vulnerability. - Incident Response: Prepare an incident response plan that includes steps for containment, eradication, and recovery in case of an exploit.
Conclusion
The vulnerability in Hikka versions below 1.6.2 is critical and requires immediate attention. Users should upgrade to the patched version and implement additional security measures to protect against potential exploits. The European cybersecurity landscape must remain vigilant to mitigate the risks associated with this vulnerability.