HomeSecurity OperationsCISA Includes Roundcube Webmail Persistent XSS Bug in Known Exploited Vulnerabilities Catalog

CISA Includes Roundcube Webmail Persistent XSS Bug in Known Exploited Vulnerabilities Catalog

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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) recently added a critical vulnerability to their Known Exploited Vulnerabilities (KEV) catalog, a move aimed at raising awareness and prompting action to address the issue. The vulnerability in question is a Persistent Cross-Site Scripting (XSS) bug affecting Roundcube Webmail, an open-source web-based email client used by many organizations.

This newly added vulnerability, tracked as CVE-2023-43770, has the potential to allow threat actors to exploit it to gain unauthorized access to sensitive information. Specifically, the exploitation of the vulnerability can lead to information disclosure via malicious link references in plain/text messages. This poses a significant threat to the security and confidentiality of email communications, potentially exposing organizations to data breaches and other security incidents.

The vulnerability was discovered by Niraj Shivtarka and affects Roundcube versions before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3. The seriousness of the issue prompted CISA to issue a directive, ordering federal agencies to address and fix the vulnerability by March 4, 2024. This action underscores the urgency and severity of the threat posed by this particular vulnerability.

CISA’s move to add this vulnerability to its Known Exploited Vulnerabilities catalog aligns with the agency’s mandate to protect the nation’s critical infrastructure from cyber threats. The agency’s Binding Operational Directive (BOD) 22-01, titled “Reducing the Significant Risk of Known Exploited Vulnerabilities,” highlights the importance of addressing identified vulnerabilities in a timely manner to mitigate the risk of exploitation.

Federal Civilian Executive Branch (FCEB) agencies are required to adhere to the guidelines outlined in BOD 22-01 and take prompt action to safeguard their networks against attacks that exploit vulnerabilities listed in the catalog. Failure to do so could result in serious security incidents and potential data breaches, underscoring the critical nature of addressing known vulnerabilities in a timely manner.

In addition to federal agencies, private organizations are strongly encouraged to review CISA’s Known Exploited Vulnerabilities catalog and address any vulnerabilities identified within their own infrastructure. By staying informed about known security issues and taking proactive measures to mitigate risks, organizations can enhance their overall security posture and reduce the likelihood of falling victim to cyber attacks and data breaches.

It is worth noting that this is not the first time that Roundcube Webmail has been targeted by threat actors. In October, a Russia-linked APT group known as Winter Vivern (aka TA473) was observed exploiting a different zero-day flaw in Roundcube webmail software. This underscores the ongoing threat posed by vulnerabilities in widely used software and the need for organizations to remain vigilant and proactive in addressing security issues.

Overall, CISA’s addition of the Roundcube Webmail Persistent XSS bug to its Known Exploited Vulnerabilities catalog serves as a reminder of the evolving cyber threat landscape and the importance of promptly addressing known security vulnerabilities. By taking proactive steps to mitigate these risks, organizations can better protect their networks and sensitive information from malicious actors seeking to exploit known vulnerabilities for nefarious purposes.

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