Path traversal in Cisco IOS XE SD-WAN Software



Published: 2021-03-30
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2021-1436
CWE ID CWE-22
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Cisco IOS XE SD-WAN
Other software / Other software solutions

Cisco 1000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

4000 Series Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cisco ASR 1000 Series Aggregation Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc

Cloud Services Router 1000V Series
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one low risk vulnerability.

1) Path traversal

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1436

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a local user to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the CLI. A local administrator can send a specially crafted HTTP request and view arbitrary files on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Cisco IOS XE SD-WAN: 16.12

Cisco 1000 Series Integrated Services Routers: All versions

4000 Series Integrated Services Routers: All versions

Cisco ASR 1000 Series Aggregation Services Routers: All versions

Cloud Services Router 1000V Series: All versions

CPE External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwpathtrav-nsrue2Mt

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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



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