#VU54607 Missing XML Validation in Cisco AsyncOS for Web Security Appliances - CVE-2021-1359

Vulnerability identifier: #VU54607

Vulnerability risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-1359

CWE-ID: CWE-112

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco AsyncOS for Web Security Appliances
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied XML input for the web interface. A remote authenticated attacker can upload specially crafted XML configuration files to execute arbitrary commands on the underlying operating system and elevate privileges to root.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco AsyncOS for Web Security Appliances: 11.8 - 12.5

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-scr-web-priv-esc-k3HCGJZ

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.