#VU76263 Heap-based buffer overflow in Cisco Systems, Inc products - CVE-2023-20156

Vulnerability identifier: #VU76263

Vulnerability 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-2023-20156

CWE-ID: CWE-122

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Small Business 200 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 300 Series Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Small Business 500 Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 250 Series Smart Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 350 Series Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 350X Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco 550X Series Stackable Managed Switches
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to a boundary error when processing requests sent to the web interface. A remote non-authenticated attacker can send a specially crafted request to the web interface, trigger a heap-based buffer overflow and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Small Business 200 Series Smart Switches: All versions

Cisco Small Business 300 Series Managed Switches: All versions

Cisco Small Business 500 Series Stackable Managed Switches: All versions

Cisco 250 Series Smart Switches: before 2.5.9.16

Cisco 350 Series Managed Switches: before 2.5.9.16

Cisco 350X Series Stackable Managed Switches: before 2.5.9.16

Cisco 550X Series Stackable Managed Switches: before 2.5.9.16

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg-web-multi-S9g4Nkgv
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe27393
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwe32313

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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