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Unsafe URL assembly flaw in allowed script location check
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Unsafe URL assembly flaw in allowed script location check
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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.
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CVSS V3 Severity and Metrics
General Information
Vendors
- canonical,
- debian,
- fedoraproject,
- libreoffice,
- opensuse,
- redhat
Products
- debian linux 10.0,
- debian linux 8.0,
- debian linux 9.0,
- enterprise linux 7.0,
- enterprise linux 8.0,
- fedora 29,
- leap 15.0,
- leap 15.1,
- libreoffice,
- ubuntu linux 16.04,
- ubuntu linux 18.04,
- ubuntu linux 19.04
References
Advisory
Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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