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With most voice traffic now flowing over the internet, phreaking shifted too. SIP servers and VoIP PBXs are often left exposed with default credentials or poor firewalling. Hackers abuse them to make free international calls, pivot into corporate networks, or flood lines with robocalls. Tools like SIPVicious and Asterisk dial plan tricks turned voice over IP into voice over exploits. Some attackers automate scans to find vulnerable systems within minutes of going online. Misconfigured voicemail boxes and conferencing features are also popular entry points.
#VoIPHacking #ModernPhreaking #SIPVicious #TelephonySecurity #HackerCraft
Cisco Duo Telephony Partner Phishing Incident Exposes MFA Message Logs
Date: April 1, 2024
CVE: N/A
Vulnerability Type: Security bypass
CWE: [[CWE-290]], [[CWE-200]]
Sources: BleepingComputer, Cisco Talos
Issue Summary
On April 1, 2024, a telephony provider partnered with Cisco Duo was compromised via a phishing attack, leading to the unauthorized access of SMS and VoIP MFA message logs. The breach exposed sensitive data for a period from March 1 to March 31, 2024. This incident was part of a broader trend of targeted attacks against multi-factor authentication (MFA) systems to bypass security measures.
Technical Key findings
Attackers used stolen employee credentials to access and download message logs from the telephony provider's systems. These logs included phone numbers, carriers, location data, timestamps, and types of messages sent for authentication purposes.
Vulnerable products
The incident specifically affected Cisco Duo's MFA service, which utilizes SMS and VoIP messages for secure user authentication.
Impact assessment
The stolen data includes information that could be exploited in further targeted phishing or social engineering attacks, posing risks of broader access to secured corporate networks and systems.
Patches or workaround
Following the breach, the affected provider invalidated the compromised credentials and implemented additional security measures. Users are advised to be vigilant for phishing attempts using the stolen data.
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