PT-2021-19559 · Cesanta · Mongooseos Mjs

Ex0Dus-0X · Published 2021-04-29 · Updated 2024-08-03 · CVE-2021-31875

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 MongooseOS mJS version 1.26

Description: A maliciously formed JSON string can trigger an off-by-one heap-based buffer overflow in mjs json parse(), potentially leading to redirection of control flow. The original reporter disputes the significance of this finding, stating that there is little opportunity to exploit this reliably for an information leak, and thus, no real security impact.

Recommendations: For version 1.26, at the moment, there is no information about a newer version that contains a fix for this issue.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-193

CWE-787

Related Identifiers

CVE-2021-31875

Affected Products

Mongooseos Mjs

References · 8

• 🔥 https://huntr.dev/bounties/1-other-mjs · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-31875 · Security Note
• https://osv.dev/vulnerability/CVE-2021-31875 · Vendor Advisory
• https://github.com/418sec/mjs/pull/2 · Patch
• https://github.com/cesanta/mjs/releases/tag/1.26 · Note
• https://t.me/cvenotify/29294 · Telegram Post
• https://t.me/cvenotify/88858 · Telegram Post
• https://t.me/cvenotify/40757 · Telegram Post