Out-of-bounds read in Cisco SD-WAN Software

1) Out-of-bounds read

EUVDB-ID: #VU55240

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-1614

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the Multiprotocol Label Switching (MPLS) packet handling function. A remote attacker can send a specially crafted MPLS packet, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco SD-WAN: 18.4.0 - 20.5

CPE2.3

• cpe:2.3:a:cisco_systems:cisco_sd-wan:18.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_sd-wan:19.2.0:*:*:*:*:*:*:*
• cpe:2.3:a:cisco_systems:cisco_sd-wan:20.3.0:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-mpls-infodisclos-MSSRFkZq

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 trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

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