CVE-2021-33035 Buffer overflow from a crafted DBF file
Fixed in Apache OpenOffice 4.1.11
Apache OpenOffice opens dBase/DBF documents and shows the contents as spreadsheets. DBF are database files with data organized in fields. When reading DBF data the size of certain fields is not checked: the data is just copied into local variables. A carefully crafted document could overflow the allocated space, leading to the execution of arbitrary code by altering the contents of the program stack.
There are no known exploits of this vulnerability.
A proof-of-concept demonstration exists.
Thanks to the reporter for discovering this issue.
Vendor: The Apache Software Foundation
All Apache OpenOffice versions 4.1.10 and older are affected.
OpenOffice.org versions may also be affected.
Install Apache OpenOffice 4.1.11 for the latest maintenance and cumulative security fixes. Use the Apache OpenOffice download page.
The Apache OpenOffice Security Team would like to thank Eugene Lim, Government Technology Agency of Singapore, for discovering and reporting this attack vector.
The latest information on Apache OpenOffice security bulletins can be found at the Bulletin Archive page.