Cisco Small Business 220 up to 1.1.4.3 Web Management Interface Request memory corruption

Summaryinfo

A vulnerability has been found in Cisco Small Business 220 up to 1.1.4.3 and classified as critical. The impacted element is an unknown function of the component Web Management Interface. This manipulation as part of Request causes memory corruption. This vulnerability is tracked as CVE-2019-1913. The attack is possible to be carried out remotely. Moreover, an exploit is present. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Cisco Small Business 220 up to 1.1.4.3. It has been declared as critical. Affected by this vulnerability is an unknown part of the component Web Management Interface. The manipulation as part of a Request leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Multiple vulnerabilities in the web management interface of Cisco Small Business 220 Series Smart Switches could allow an unauthenticated, remote attacker to overflow a buffer, which then allows the execution of arbitrary code with root privileges on the underlying operating system. The vulnerabilities are due to insufficient validation of user-supplied input and improper boundary checks when reading data into an internal buffer. An attacker could exploit these vulnerabilities by sending malicious requests to the web management interface of an affected device. Depending on the configuration of the affected switch, the malicious requests must be sent via HTTP or HTTPS.

The weakness was disclosed 08/07/2019 as cisco-sa-20190806-sb220-rce as confirmed advisory (Website). The advisory is shared at tools.cisco.com. This vulnerability is known as CVE-2019-1913 since 12/06/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. The advisory points out:

Multiple vulnerabilities in the web management interface of Cisco Small Business 220 Series Smart Switches could allow an unauthenticated, remote attacker to overflow a buffer, which then allows the execution of arbitrary code with root privileges on the underlying operating system.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The advisory illustrates:

The vulnerabilities are due to insufficient validation of user-supplied input and improper boundary checks when reading data into an internal buffer. An attacker could exploit these vulnerabilities by sending malicious requests to the web management interface of an affected device. Depending on the configuration of the affected switch, the malicious requests must be sent via HTTP or HTTPS.

Upgrading to version 1.1.4.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (47442). Additional details are provided at zdnet.com. The entries VDB-139596 and VDB-139598 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Cisco

Name

• Small Business 220

Version

• 1.1.4.0
• 1.1.4.1
• 1.1.4.2
• 1.1.4.3

License

• commercial

Website

• Vendor: https://www.cisco.com/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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