CVE-2019-9853: document foundation libreoffice Improper Encoding or Escaping of Output

Vulnerability summary

CVE-2019-9853 is a high (CVSS 7.8) Improper Encoding or Escaping of Output vulnerability in document foundation libreoffice. EPSS estimates a 3.08% chance of exploitation in the next 30 days, higher than 87.4% of scored vulnerabilities.

Timeline

1. 27-09-2019
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

LibreOffice documents can contain macros. The execution of those macros is controlled by the document security settings, typically execution of macros are blocked by default. A URL decoding flaw existed in how the urls to the macros within the document were processed and categorized, resulting in the possibility to construct a document where macro execution bypassed the security settings. The documents were correctly detected as containing macros, and prompted the user to their existence within the documents, but macros within the document were subsequently not controlled by the security settings allowing arbitrary macro execution This issue affects: LibreOffice 6.2 series versions prior to 6.2.7; LibreOffice 6.3 series versions prior to 6.3.1.

• CWE-116Improper Encoding or Escaping of OutputThe product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.