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CVE-2023-24621

CVE-2023-24621: Esoteric YamlBeans Unsafe Deserialization vulnerability

7.8

CVSS Score
3.1

Basic Information

CVE ID
CVE-2023-24621
GHSA ID
GHSA-jm7r-4pg6-gf26
EPSS Score
0.08196%
CWE
CWE-502
Published
8/25/2023
Updated
11/8/2023
KEV Status
No
Technology
TechnologyJava

Technical Details

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Package NameEcosystemVulnerable VersionsFirst Patched Version
com.esotericsoftware.yamlbeans:yamlbeansmaven<= 1.15

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from YamlBeans' default behavior to honor class tags in YAML payloads during deserialization. The YamlReader.read() method processes these tags without validation, enabling unsafe polymorphic deserialization. The provided security advisory explicitly demonstrates how YAML-specified classes bypass developer expectations (Config.class being overridden), confirming the read() method's role in the exploit chain. No evidence of patching or safe deserialization hooks exists in the provided materials.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

*n issu* w*s *is*ov*r** in *sot*ri* Y*ml***ns t*rou** *.**. It *llows untrust** **s*ri*lis*tion to J*v* *l*ss*s *y ****ult, w**r* t** **t* *n* *l*ss *r* *ontroll** *y t** *ut*or o* t** Y*ML *o*um*nt **in* pro**ss**.

Reasoning

T** vuln*r**ility st*ms *rom Y*ml***ns' ****ult ****vior to *onor *l*ss t**s in Y*ML p*ylo**s *urin* **s*ri*liz*tion. T** `Y*mlR****r.r***()` m*t*o* pro**ss*s t**s* t**s wit*out v*li**tion, *n**lin* uns*** polymorp*i* **s*ri*liz*tion. T** provi*** s*