SAML token theft via CRLF injection
Published Mar 6, 2024 · Updated Aug 1, 2024
CRLF injection in Cisco Secure Client allows remote attackers to steal SAML tokens or execute browser scripts through a crafted link. The SAML authentication flow insufficiently validates user-controlled link input, allowing CRLF sequences to alter data handled by the external browser. Exploitation requires a user to click the link while establishing a VPN session through a headend configured for SAML External Browser; a stolen token grants the user's VPN privileges, while protected hosts still require additional credentials.
Summary
What happened
CRLF injection in Cisco Secure Client allows remote attackers to steal SAML tokens or execute browser scripts through a crafted link. The SAML authentication flow insufficiently validates user-controlled link input, allowing CRLF sequences to alter data handled by the external browser. Exploitation requires a user to click the link while establishing a VPN session through a headend configured for SAML External Browser; a stolen token grants the user's VPN privileges, while protected hosts still require additional credentials.
The record
- CVE
- CVE-2024-20337
- Published
- Mar 6, 2024
- Updated
- Aug 1, 2024
- Vendor
- ClamAV
- Product
- Cisco Secure Client
- Classifications
- CWE-93, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 6, 2024CVE publishedPublication date reported by the CVE source.
- Aug 1, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.10.00093
- Affected versionversion=4.10.01075
- Affected versionversion=4.10.02086
- Affected versionversion=4.10.03104
- Affected versionversion=4.10.04065
- Affected versionversion=4.10.04071
- Affected versionversion=4.10.05085
- Affected versionversion=4.10.05095
- Affected versionversion=4.10.05111
- Affected versionversion=4.10.06079
- Affected versionversion=4.10.06090
- Affected versionversion=4.10.07061
- Affected versionversion=4.10.07062
- Affected versionversion=4.10.07073
- Affected versionversion=4.9.00086
- Affected versionversion=4.9.01095
- Affected versionversion=4.9.02028
- Affected versionversion=4.9.03047
- Affected versionversion=4.9.03049
- Affected versionversion=4.9.04043
- Affected versionversion=4.9.04053
- Affected versionversion=4.9.05042
- Affected versionversion=4.9.06037
- Affected versionversion=5.0.00238
- Affected versionversion=5.0.00529
- Affected versionversion=5.0.00556
- Affected versionversion=5.0.01242
- Affected versionversion=5.0.02075
- Affected versionversion=5.0.03072
- Affected versionversion=5.0.03076
- Affected versionversion=5.0.04032
- Affected versionversion=5.0.05040
- Affected versionversion=5.1.0.136
- Affected versionversion=5.1.1.42
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo