high
8.2
CWE
93 119 79 89 20 94
Advisory Published
Updated

CVE-2024-20337: CRLF Injection

First published: Wed Mar 06 2024(Updated: )

A vulnerability in the SAML authentication process of Cisco Secure Client could allow an unauthenticated, remote attacker to conduct a carriage return line feed (CRLF) injection attack against a user. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link while establishing a VPN session. A successful exploit could allow the attacker to execute arbitrary script code in the browser or access sensitive, browser-based information, including a valid SAML token. The attacker could then use the token to establish a remote access VPN session with the privileges of the affected user. Individual hosts and services behind the VPN headend would still need additional credentials for successful access.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Secure Client

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Reference Links

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of CVE-2024-20337?

    CVE-2024-20337 has been classified with a severity rating that may allow remote attackers to exploit the vulnerability.

  • How do I fix CVE-2024-20337?

    To mitigate CVE-2024-20337, users should apply the latest security patch provided by Cisco for the Secure Client.

  • Who is affected by CVE-2024-20337?

    CVE-2024-20337 affects users of Cisco Secure Client specifically using the vulnerable SAML authentication process.

  • What type of attack can be executed through CVE-2024-20337?

    CVE-2024-20337 can enable attackers to perform a carriage return line feed (CRLF) injection attack.

  • Can CVE-2024-20337 be exploited remotely?

    Yes, CVE-2024-20337 can be exploited by unauthenticated remote attackers against targeted users.

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