LibreOffice up to 6.2.6/6.3.2 URL Encoding share/Scripts/python access control

Summaryinfo

A vulnerability identified as critical has been detected in LibreOffice up to 6.2.6/6.3.2. This impacts an unknown function of the file share/Scripts/python of the component URL Encoding. Performing a manipulation results in access control. This vulnerability is identified as CVE-2019-9854. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in LibreOffice up to 6.2.6/6.3.2 (Office Suite Software). This affects some unknown functionality of the file share/Scripts/python of the component URL Encoding. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 09/06/2019 (Website). The advisory is shared at libreoffice.org. This vulnerability is uniquely identified as CVE-2019-9854 since 03/17/2019. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 276434 (TencentOS Server 3: libreoffice (TSSA-2022:0038)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.2.7 or 6.3.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (276434). Entry connected to this vulnerability is available at VDB-141382. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Office Suite Software

Name

• LibreOffice

Version

• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.3.0
• 6.3.1
• 6.3.2

License

• open-source

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CPE 2.2info

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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