Remote code execution in Cisco IOS XE SD-WAN Software vDaemon

1) Buffer overflow

EUVDB-ID: #VU51706

Risk: Critical

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1433

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing network traffic in the vDaemon process. A remote attacker can send specially crafted packets to the system, trigger memory corruption and execute arbitrary code on the target system with root privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

The following devices are affected by this vulnerability:

• 1000 Series Integrated Services Routers (ISRs)
• 4000 Series ISRs
• 5400 Enterprise Network Compute System with Cisco Integrated Services Virtual Router (ISRv) installed
• ASR 1000 Series Aggregation Services Routers
• Cloud Services Router 1000V Series

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco SD-WAN: 16.12.4 - 17.3.0

Cisco SD-WAN vEdge Routers: All versions

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-buffover-CqdRWLc
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu42778

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.