Cisco Duo raises awareness over a breach in third-party data security, revealing the exposure of SMS MFA logs.

In the ever-evolving landscape of cybersecurity, safeguarding sensitive information and ensuring secure access to corporate networks are paramount concerns for organizations worldwide. Recently, Cisco Duo, a leading provider of multi-factor authentication (MFA) and Single Sign-On services, found itself grappling with a significant breach that shed light on the evolving threats confronting modern enterprises. 

On April 1, 2024, Cisco Duo’s security team sent out a warning to its extensive customer base regarding a cyberattack targeting their telephony provider, which handles the transmission of SMS and VoIP MFA messages. According to reports, threat actors leveraged employee credentials acquired through a sophisticated phishing attack to infiltrate the provider’s systems. 

Following the breach, the attackers successfully obtained and extracted SMS and VoIP MFA message logs linked to specific Duo accounts, covering the timeframe from March 1, 2024, to March 31, 2024.

The ramifications of this breach are deeply concerning. While the provider assured that the threat actors did not access the contents of the messages or utilize their access to send messages to customers, the stolen message logs contain data that could be exploited in targeted phishing campaigns. 

This poses a significant risk to affected organizations, potentially resulting in unauthorized access to sensitive information, including corporate credentials.

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