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CVE-2021-40439— Billion Laughs

Quick assessment

Affected
Apache Software Foundation Apache OpenOffice
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.

Apache OpenOffice是美国阿帕奇（Apache）基金会的一款开源的办公软件套件。该套件包含文本文档、电子表格、演示文稿、绘图、数据库等。 Apache OpenOffice存在代码问题漏洞，该漏洞源于Apache OpenOffice依赖于expat软件。Expat 2.1.0之前的版本受到CVE-2013-0340“Billion Laughs”实体扩展拒绝服务攻击，攻击者可以通过精心制作的XML文件加以利用。

AI Predicted 5.3 Difficulty: Moderate EPSS 3.87% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-40439

Vulnerability Information
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Vulnerability Title
Billion Laughs
Source: CVE Program / CVE List V5
Vulnerability Description
Apache OpenOffice has a dependency on expat software. Versions prior to 2.1.0 were subject to CVE-2013-0340 a "Billion Laughs" entity expansion denial of service attack and exploit via crafted XML files. ODF files consist of a set of XML files. All versions of Apache OpenOffice up to 4.1.10 are subject to this issue. expat in version 4.1.11 is patched.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache OpenOffice 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache OpenOffice是美国阿帕奇（Apache）基金会的一款开源的办公软件套件。该套件包含文本文档、电子表格、演示文稿、绘图、数据库等。 Apache OpenOffice存在代码问题漏洞，该漏洞源于Apache OpenOffice依赖于expat软件。Expat 2.1.0之前的版本受到CVE-2013-0340“Billion Laughs”实体扩展拒绝服务攻击，攻击者可以通过精心制作的XML文件加以利用。
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
Apache Software Foundation Apache OpenOffice Apache OpenOffice ~ 4.1.10 -

II. Public POCs for CVE-2021-40439

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III. Intelligence Information for CVE-2021-40439

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Mailing List Discussions for CVE-2021-40439 (2)

Same Patch Batch · Apache Software Foundation · 2021-10-07 · 3 CVEs total

CVE-2021-28129 DEB packaging for Apache OpenOffice 4.1.8 installed with a non-root userid and groupid
CVE-2021-42013 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomple

IV. Related Vulnerabilities

Same product: Apache OpenOffice
Same vendor: Apache Software Foundation
Same weakness: CWE-611

V. Comments for CVE-2021-40439

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