Cisco IOS XE Linux Shell input validation

Summaryinfo

A vulnerability described as critical has been identified in Cisco IOS XE. This affects an unknown function of the component Linux Shell. Such manipulation leads to input validation. This vulnerability is documented as CVE-2019-1756. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Cisco IOS XE (Router Operating System) (unknown version). Affected by this issue is an unknown code block of the component Linux Shell. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in Cisco IOS XE Software could allow an authenticated, remote attacker to execute commands on the underlying Linux shell of an affected device with root privileges. The vulnerability occurs because the affected software improperly sanitizes user-supplied input. An attacker who has valid administrator access to an affected device could exploit this vulnerability by supplying a username with a malicious payload in the web UI and subsequently making a request to a specific endpoint in the web UI. A successful exploit could allow the attacker to run arbitrary commands as the root user, allowing complete compromise of the system.

The bug was discovered 03/27/2019. The weakness was released 03/28/2019 (Website). The advisory is shared for download at securityfocus.com. This vulnerability is handled as CVE-2019-1756 since 12/06/2018. The attack may be launched remotely. The requirement for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 08/17/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316390 (Cisco IOS XE Software Command Injection Vulnerability(cisco-sa-20190327-iosxe-cmdinject)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-132540, VDB-132539, VDB-132535 and VDB-132534. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS XE

License

• commercial

Website

• Vendor: https://www.cisco.com/

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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