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CVE-2019-9852— Insufficient URL encoding 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 6.2.6之前版本中存在安全漏洞。攻击者可利用该漏洞绕过为解决CVE-2018-16858漏洞而添加的安全保护。

AI Predicted 7.5 Difficulty: Easy EPSS 1.75% · P77

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2019-9852

Vulnerability Information
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Vulnerability Title
Insufficient URL encoding 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-2018-16858, to avoid a directory traversal attack where scripts in arbitrary locations on the file system could be executed. However this new protection could be bypassed by a URL encoding attack. In the fixed versions, the parsed url describing the script location is correctly encoded before further processing. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.
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 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 6.2.6之前版本中存在安全漏洞。攻击者可利用该漏洞绕过为解决CVE-2018-16858漏洞而添加的安全保护。
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 unspecified ~ 6.2.6 -

II. Public POCs for CVE-2019-9852

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III. Intelligence Information for CVE-2019-9852

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Vendor Advisories for CVE-2019-9852 (2)

Mailing List Discussions for CVE-2019-9852 (6)

Other References for CVE-2019-9852 (1)

Same Patch Batch · Document Foundation · 2019-08-15 · 3 CVEs total

CVE-2019-9850 Insufficient url validation allowing LibreLogo script execution
CVE-2019-9851 LibreLogo global-event script execution

IV. Related Vulnerabilities

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

V. Comments for CVE-2019-9852

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