Denial of service in Cisco Small Business Series Switches

1) Input validation error

EUVDB-ID: #VU19029

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-1891

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of requests sent to the web interface. A remote attacker can send a malicious request to the web interface and cause an unexpected reload of the device, resulting in a DoS condition.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Small Business 500 Series Stackable Managed Switches: before 1.4.10.6

Cisco Small Business 300 Series Managed Switches: before 1.4.10.6

Cisco Small Business 200 Series Smart Switches: before 1.4.10.6

CPE2.3

• cpe:2.3:h:cisco_systems:cisco_small_business_500_series_stackable_managed_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_small_business_300_series_managed_switches:*:*:*:*:*:*:*:*
• cpe:2.3:h:cisco_systems:cisco_small_business_200_series_smart_switches:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-sbss-dos

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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