Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Libreoffice | Libreoffice | >= 6.2.0, < 6.2.6 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00040.html
- http://packetstormsecurity.com/files/156474/Open-Xchange-App-Suite-Documents-Ser
- http://seclists.org/fulldisclosure/2020/Feb/23
- https://lists.apache.org/thread.html/19c917f7c8a0d8f62142046fabfe3e2c7d6091ef1f9
- https://lists.apache.org/thread.html/27339e8a9a1e9bb47fbdb939b338256d0356250a197
- https://lists.apache.org/thread.html/306a374361891eb17c6cffc99c3d7be1d3152a99c83
- https://lists.apache.org/thread.html/3a5570ca5cd14ad08e24684c71cfeff3a507f108fe3
- https://lists.apache.org/thread.html/4ae0e6e52600f408d943ded079d314733ce188b04b0
- https://lists.apache.org/thread.html/70da9481dca267405e1d79e53942264765ef3f55c9a
- https://lists.apache.org/thread.html/7394e6b5f78a878bd0c44e9bc9adf90b8cdf49e9adc
- https://lists.apache.org/thread.html/9dc85d9937ad7f101047c53f78c00e8ceb135eaeff7
- https://lists.apache.org/thread.html/a5231ad45b030b54828c7b0b62a7e7d4b48481c7cb8
- https://lists.apache.org/thread.html/a540d1b6f9a7ebb206adba02839f654a6ee63a7b097
- https://lists.apache.org/thread.html/ca216900abd846f0220fe18b95f9f787bdbe0e87fa4
- https://lists.debian.org/debian-lts-announce/2019/10/msg00005.html
FAQ
What is CVE-2019-9853?
CVE-2019-9853 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 exist...
How severe is CVE-2019-9853?
CVE-2019-9853 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-9853?
Check the references section above for vendor advisories and patch information. Affected products include: Libreoffice Libreoffice.