Cisco Secure Email Content Scanning/Message Filtering absolute path traversal

Summaryinfo

A vulnerability was found in Cisco Secure Email. It has been rated as very critical. This affects an unknown part of the component Content Scanning/Message Filtering. Performing a manipulation results in absolute path traversal. This vulnerability is known as CVE-2024-20401. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as very critical has been found in Cisco Secure Email (version unknown). This affects an unknown function of the component Content Scanning/Message Filtering. The manipulation with an unknown input leads to a absolute path traversal vulnerability. CWE is classifying the issue as CWE-36. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the content scanning and message filtering features of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to overwrite arbitrary files on the underlying operating system. This vulnerability is due to improper handling of email attachments when file analysis and content filters are enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device. A successful exploit could allow the attacker to replace any file on the underlying file system. The attacker could then perform any of the following actions: add users with root privileges, modify the device configuration, execute arbitrary code, or cause a permanent denial of service (DoS) condition on the affected device. Note: Manual intervention is required to recover from the DoS condition. Customers are advised to contact the Cisco Technical Assistance Center (TAC) to help recover a device in this condition.

The advisory is shared at sec.cloudapps.cisco.com. This vulnerability is uniquely identified as CVE-2024-20401 since 11/08/2023. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/18/2024). MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading eliminates this vulnerability.

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Productinfo

Vendor

• Cisco

Name

• Secure Email

License

• commercial

Website

• Vendor: https://www.cisco.com/

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