shellinabox up to 2.20 HTTP Request Parser libhttp/url.c resource consumption

Summaryinfo

A vulnerability described as problematic has been identified in shellinabox up to 2.20. Affected is an unknown function of the file libhttp/url.c of the component HTTP Request Parser. Executing a manipulation can lead to resource consumption. This vulnerability appears as CVE-2018-16789. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in shellinabox up to 2.20. This vulnerability affects an unknown code block of the file libhttp/url.c of the component HTTP Request Parser. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. As an impact it is known to affect availability. CVE summarizes:

libhttp/url.c in shellinabox through 2.20 has an implementation flaw in the HTTP request parsing logic. By sending a crafted multipart/form-data HTTP request, an attacker could exploit this to force shellinaboxd into an infinite loop, exhausting available CPU resources and taking the service down.

The bug was discovered 10/26/2018. The weakness was presented 03/21/2019 (Website). The advisory is available at code.google.com. This vulnerability was named CVE-2018-16789 since 09/09/2018. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The vulnerability was handled as a non-public zero-day exploit for at least 146 days. During that time the estimated underground price was around $0-$5k.

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

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Productinfo

Name

• shellinabox

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20

License

• open-source

Website

• Product: https://github.com/shellinabox/shellinabox/

CPE 2.3info

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CPE 2.2info

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