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CVE-2021-36093— DoS attack using PostMaster filters

Quick assessment

Affected
OTRS AG ((OTRS)) Community Edition
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.

OTRS是德国 （OTRS）公司的一个应用软件。一个服务管理软件。 OTRS存在安全漏洞，该漏洞源于创建的电子邮件可能会被PostMaster过滤器处理时卡住，导致拒绝服务。

CVSS 5.3 · Medium EPSS 1.11% · P65

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-36093

Vulnerability Information
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Vulnerability Title
DoS attack using PostMaster filters
Source: CVE Program / CVE List V5
Vulnerability Description
It's possible to create an email which can be stuck while being processed by PostMaster filters, causing DoS. This issue affects: OTRS AG ((OTRS)) Community Edition 6.0.x version 6.0.1 and later versions. OTRS AG OTRS 7.0.x version 7.0.28 and prior versions; 8.0.x version 8.0.15 and prior versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的正则表达式
Source: CVE Program / CVE List V5
Vulnerability Title
OTRS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OTRS是德国 （OTRS）公司的一个应用软件。一个服务管理软件。 OTRS存在安全漏洞，该漏洞源于创建的电子邮件可能会被PostMaster过滤器处理时卡住，导致拒绝服务。
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
OTRS AG ((OTRS)) Community Edition 6.0.1 ~ 6.0.x* -
OTRS AG OTRS 7.0.x ~ 7.0.28 -

II. Public POCs for CVE-2021-36093

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III. Intelligence Information for CVE-2021-36093

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Other References for CVE-2021-36093 (1)

Same Patch Batch · OTRS AG · 2021-09-06 · 4 CVEs total

CVE-2021-36094 5.7 MEDIUM XSS attack in appointment edit popup screen
CVE-2021-36095 5.3 MEDIUM User enumeration issue using "lost password" feature
CVE-2021-36096 5.2 MEDIUM Support Bundle includes S/Mime and PGP secret or PIN

IV. Related Vulnerabilities

Same product: ((OTRS)) Community Edition
Same vendor: OTRS AG
Same weakness: CWE-185

V. Comments for CVE-2021-36093

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