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CVE-2019-9853— Insufficient URL decoding flaw in categorizing macro location

Quick assessment

Affected
Document Foundation LibreOffice
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.

LibreOffice是文档基金会（The Document Foundation，TDF）的一套开源的办公软件套件。该产品包含Writer（文本文档）、Calc（电子表格）和Impress（演示文稿）等应用程序。 LibreOffice 6.2.7之前的6.2版本和6.3.1之前的6.3版本中存在安全漏洞。攻击者可利用该漏洞绕过安全限制，执行任意宏。

AI Predicted 7.8 Difficulty: Moderate EPSS 3.08% · P87

Possible ATT&CK Techniques 1 AI

T1218 · System Binary Proxy Execution
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I. Basic Information for CVE-2019-9853

Vulnerability Information
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Vulnerability Title
Insufficient URL decoding flaw in categorizing macro location
Source: CVE Program / CVE List V5
Vulnerability Description
LibreOffice documents can contain macros. The execution of those macros is controlled by the document security settings, typically execution of macros are blocked by default. A URL decoding flaw existed in how the urls to the macros within the document were processed and categorized, resulting in the possibility to construct a document where macro execution bypassed the security settings. The documents were correctly detected as containing macros, and prompted the user to their existence within the documents, but macros within the document were subsequently not controlled by the security settings allowing arbitrary macro execution This issue affects: LibreOffice 6.2 series versions prior to 6.2.7; LibreOffice 6.3 series versions prior to 6.3.1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
LibreOffice 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreOffice是文档基金会（The Document Foundation，TDF）的一套开源的办公软件套件。该产品包含Writer（文本文档）、Calc（电子表格）和Impress（演示文稿）等应用程序。 LibreOffice 6.2.7之前的6.2版本和6.3.1之前的6.3版本中存在安全漏洞。攻击者可利用该漏洞绕过安全限制，执行任意宏。
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
Document Foundation LibreOffice 6.2 series ~ 6.2.7 -

II. Public POCs for CVE-2019-9853

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III. Intelligence Information for CVE-2019-9853

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Exploits & Public PoCs for CVE-2019-9853 (1)

Mailing List Discussions for CVE-2019-9853 (15)

Other References for CVE-2019-9853 (1)

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: Document Foundation
Same weakness: CWE-116

V. Comments for CVE-2019-9853

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