PT-2019-10056 · Cesanta · Mongoose Embedded Web Server Library

Published 2019-06-10 · Updated 2019-06-11 · CVE-2018-20355

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Cesanta Mongoose Embedded Web Server Library versions 6.13 and earlier

Description: The issue is caused by a use-after-free vulnerability in the mg http free proto data cgi function call in mongoose.c, which can lead to an invalid write of 8 bytes. This can result in a denial of service, causing the application to crash, or potentially allow for remote code execution.

Recommendations: For versions 6.13 and earlier, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2018-20355

Affected Products

Mongoose Embedded Web Server Library

References · 3

• 🔥 https://github.com/insi2304/mongoose-6.13-fuzz/blob/master/Simplest_Web_Server_Use_After_Free-mg_http_free_proto_data_cgi.png · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2018-20355 · Security Note
• https://osv.dev/vulnerability/CVE-2018-20355 · Vendor Advisory