PT-2021-20319 · Unknown · Reborncore

Ryotak · Published 2021-05-31 · Updated 2021-06-11 · CVE-2021-33790

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: RebornCore library versions prior to 4.7.3

Description: The issue allows remote code execution due to the deserialization of untrusted data in ObjectInputStream.readObject as part of reborncore.common.network.ExtendedPacketBuffer. This enables an attacker to instantiate any class on the classpath with any data. The presence of a class usable for exploitation depends on the installed Minecraft modifications.

Recommendations: For versions prior to 4.7.3, update to version 4.7.3 or later to resolve the issue. As a temporary workaround, consider restricting access to the ExtendedPacketBuffer class to minimize the risk of exploitation.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2021-33790

GHSA-R7PG-4XRF-7MRM

Affected Products

Reborncore

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2021-33790 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33790 · Vendor Advisory
• https://github.com/TechReborn/RebornCore/security/advisories/GHSA-r7pg-4xrf-7mrm · Note
• https://vuln.ryotak.me/advisories/45 · Note
• https://curseforge.com/minecraft/mc-mods/reborncore · Note
• https://t.me/cvenotify/15295 · Telegram Post