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CVE-2019-9854— Unsafe URL assembly flaw in allowed script location check

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版本中存在路径遍历漏洞。该漏洞源于网络系统或产品未能正确地过滤资源或文件路径中的特殊元素。攻击者可利用该漏洞访问受限目录之外的位置。

AI Predicted 7.8 Difficulty: Moderate EPSS 1.76% · P77

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2019-9854

Vulnerability Information
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Vulnerability Title
Unsafe URL assembly flaw in allowed script location check
Source: CVE Program / CVE List V5
Vulnerability Description
LibreOffice has a feature where documents can specify that pre-installed macros can be executed on various script events such as mouse-over, document-open etc. Access is intended to be restricted to scripts under the share/Scripts/python, user/Scripts/python sub-directories of the LibreOffice install. Protection was added, to address CVE-2019-9852, to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed by employing a URL encoding attack to defeat the path verification step. However this protection could be bypassed by taking advantage of a flaw in how LibreOffice assembled the final script URL location directly from components of the passed in path as opposed to solely from the sanitized output of the path verification step. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
LibreOffice 路径遍历漏洞
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版本中存在路径遍历漏洞。该漏洞源于网络系统或产品未能正确地过滤资源或文件路径中的特殊元素。攻击者可利用该漏洞访问受限目录之外的位置。
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 ~ 6.2.7 -

II. Public POCs for CVE-2019-9854

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III. Intelligence Information for CVE-2019-9854

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Vendor Advisories for CVE-2019-9854 (2)

Mailing List Discussions for CVE-2019-9854 (5)

Other References for CVE-2019-9854 (1)

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: Document Foundation

V. Comments for CVE-2019-9854

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