Cesanta Mongoose 6.8 WebSocket integer overflow

Summaryinfo

A vulnerability was found in Cesanta Mongoose 6.8. It has been classified as critical. Affected by this vulnerability is an unknown functionality of the component WebSocket. This manipulation causes integer overflow. The identification of this vulnerability is CVE-2017-2921. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Cesanta Mongoose 6.8 and classified as critical. Affected by this vulnerability is an unknown code block of the component WebSocket. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An exploitable memory corruption vulnerability exists in the Websocket protocol implementation of Cesanta Mongoose 6.8. A specially crafted websocket packet can cause an integer overflow, leading to a heap buffer overflow and resulting in denial of service and potential remote code execution. An attacker needs to send a specially crafted websocket packet over network to trigger this vulnerability.

The bug was discovered 10/31/2017. The weakness was shared 11/07/2017 (Website). It is possible to read the advisory at talosintelligence.com. This vulnerability is known as CVE-2017-2921 since 12/01/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 7 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.

The entry VDB-109220 is related to this item. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Cesanta

Name

• Mongoose

Version

• 6.8

License

• open-source

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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