Cisco Web Security Appliance Advanced Malware Protection Attachment security check

Summaryinfo

A vulnerability was found in Cisco Web Security Appliance. It has been classified as critical. The impacted element is an unknown function of the component Advanced Malware Protection. The manipulation as part of Attachment leads to security check. This vulnerability is uniquely identified as CVE-2017-12303. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Cisco Web Security Appliance (Anti-Malware Software) (unknown version). It has been rated as critical. This issue affects an unknown code block of the component Advanced Malware Protection. The manipulation as part of a Attachment leads to a security check vulnerability. Using CWE to declare the problem leads to CWE-358. The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in the Advanced Malware Protection (AMP) file filtering feature of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured AMP file filtering rule. The file types affected are zipped or archived file types. The vulnerability is due to incorrect and different file hash values when AMP scans the file. An attacker could exploit this vulnerability by sending a crafted email file attachment through the targeted device. An exploit could allow the attacker to bypass a configured AMP file filter. Cisco Bug IDs: CSCvf52943.

The bug was discovered 11/15/2017. The weakness was disclosed 11/16/2017 with Cisco as cisco-sa-20171115-wsa as confirmed advisory (Website). The advisory is shared at tools.cisco.com. The identification of this vulnerability is CVE-2017-12303 since 08/03/2017. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $25k-$100k at the moment (estimation calculated on 01/24/2021). MITRE ATT&CK project uses the attack technique T1211 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $25k-$100k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 101932†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Anti-Malware Software

Vendor

• Cisco

Name

• Web Security Appliance

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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