PT-2019-10055 · Cesanta · Cesanta Mongoose Embedded Web Server Library

Published 2019-06-10 · Updated 2019-06-11 · CVE-2018-20354

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 get proto data function, located in mongoose.c. This can lead to an invalid read of 8 bytes, resulting in a denial of service, which is an application crash, or potentially allowing remote code execution.

Recommendations: For Cesanta Mongoose Embedded Web Server Library versions 6.13 and earlier, consider updating to a version later than 6.13 to resolve the issue. As a temporary workaround, restrict access to the mg http get proto data function to minimize the risk of exploitation.

Exploit

Fix

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2018-20354

Affected Products

Cesanta Mongoose Embedded Web Server Library

References · 3

• 🔥 https://github.com/insi2304/mongoose-6.13-fuzz/blob/master/Simplest_Web_Server_Use_After_Free-read-mg_http_get_proto_data.png · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2018-20354 · Security Note
• https://osv.dev/vulnerability/CVE-2018-20354 · Vendor Advisory