Insufficient URL encoding flaw in allowed script location check
CVE-2019-9852

7.8HIGH

Key Information:

Vendor

Document Foundation

Status
Libreoffice
Vendor
CVE Published:
15 August 2019

What is CVE-2019-9852?

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.

Affected Version(s)

LibreOffice < 6.2.6

References

https://www.libreoffice.org/about-us/security/advisories/...
x_refsource_MISC
https://seclists.org/bugtraq/2019/Aug/28
mailing-listx_refsource_BUGTRAQ
https://www.debian.org/security/2019/dsa-4501
vendor-advisoryx_refsource_DEBIAN

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks to Nils Emmerich of ERNW Research GmbH for discovering and reporting this issue
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