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CVE-2021-29433— Denial of service (via resource exhaustion) due to improper input validation

Quick assessment

Affected
matrix-org sydent
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Matrix Sydent是英国Matrix基金会的一款Matrix身份验证服务器API的实现。 Matrix Sydent 存在输入验证错误漏洞，该漏洞源于缺少对某些参数的输入验证可能会导致磁盘空间和内存的过度使用，从而导致资源耗尽。

CVSS 4.3 · Medium EPSS 0.93% · P59

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-29433

Vulnerability Information
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Vulnerability Title
Denial of service (via resource exhaustion) due to improper input validation
Source: CVE Program / CVE List V5
Vulnerability Description
Sydent is a reference Matrix identity server. In Sydent versions 2.2.0 and prior, sissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. A patch for the vulnerability is in version 2.3.0. No workarounds are known to exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Sydent 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Sydent是英国Matrix基金会的一款Matrix身份验证服务器API的实现。 Matrix Sydent 存在输入验证错误漏洞，该漏洞源于缺少对某些参数的输入验证可能会导致磁盘空间和内存的过度使用，从而导致资源耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org sydent <= 2.2.0 -

II. Public POCs for CVE-2021-29433

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III. Intelligence Information for CVE-2021-29433

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Patches & Fixes for CVE-2021-29433 (1)

Vendor Advisories for CVE-2021-29433 (1)

Same Patch Batch · matrix-org · 2021-04-15 · 4 CVEs total

CVE-2021-29431 7.7 HIGH SSRF in Sydent due to missing validation of hostnames
CVE-2021-29430 7.5 HIGH Denial of service attack via memory exhaustion
CVE-2021-29432 5.3 MEDIUM Malicious users could control the content of invitation emails

IV. Related Vulnerabilities

Same product: sydent
Same vendor: matrix-org
Same weakness: CWE-20

V. Comments for CVE-2021-29433

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