Software Engineering Institute

OPeNDAP is a software package designed to help researchers exchange data sets that are stored in different formats. The most recent version of OPeNDAP is server 4, or Hyrax. The Hyrax server includes a daemon called BES.

From the BES download page:

BES is a new, high-performance back-end server software framework that allows data providers more flexibility in providing end users views of their data. The current OPeNDAP data objects (DAS, DDS, and DataDDS) are still supported, but now data providers can add new data views, provide new functionality, and new features to their end users through the BES modular design. Providers can add new data handlers, new data objects/views, the ability to define views with constraints and aggregation, the ability to add reporting mechanisms, initialization hooks, and more.

The BES server improperly sanitizes data supplied in compressed files. An attacker may be able to exploit this vulnerability by sending a specially crafted compressed file to a vulnerable server.

An attacker to execute arbitrary commands on a vulnerable server.

Upgrade
BES 3.5.0 has been released to address this issue. Administrators are encouraged to upgrade as soon as possible.

Restrict access

Limiting network access to the BES daemon may prevent a remote attacker from exploiting this vulnerability. See BES installation guide for more details.