LibreOffice up to 6.2.5 LibreLogo URL input validation

Summaryinfo

A vulnerability categorized as critical has been discovered in LibreOffice up to 6.2.5. This affects an unknown function of the component LibreLogo. The manipulation as part of URL results in input validation. This vulnerability was named CVE-2019-9850. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in LibreOffice up to 6.2.5 (Office Suite Software). Affected is an unknown functionality of the component LibreLogo. The manipulation as part of a URL leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

LibreOffice is typically bundled with LibreLogo, a programmable turtle vector graphics script, which can execute arbitrary python commands contained with the document it is launched from. LibreOffice also has a feature where documents can specify that pre-installed scripts can be executed on various document script events such as mouse-over, etc. Protection was added, to address CVE-2019-9848, to block calling LibreLogo from script event handers. However an insufficient url validation vulnerability in LibreOffice allowed malicious to bypass that protection and again trigger calling LibreLogo from script event handlers. This issue affects: Document Foundation LibreOffice versions prior to 6.2.6.

The weakness was presented 08/15/2019 (Website). The advisory is shared for download at libreoffice.org. This vulnerability is traded as CVE-2019-9850 since 03/17/2019. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

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 6.2.6 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (276434). See VDB-140150 and VDB-140149 for similar entries. Once again VulDB remains the best source for vulnerability data.

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

License

• open-source

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CPE 2.2info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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