CVE-2020-5212

(This information may be updated from time to time.)

NetHack: MENUCOLOR configuration file option is subject to a buffer overflow

Severity: High
Affected versions: 3.6.0, 3.6.1, 3.6.2, 3.6.3, 3.6.4
First Patched Version: 3.6.5
Git commit(s): a842fda44c612cd9a126c3039a575da92c6ee0f4

Basic Information:
Extremely long value for the MENUCOLOR configuration file option can cause a buffer overflow resulting in a crash or remote code execution/privilege escalation.

This vulnerability affects systems that have NetHack installed suid/sgid and shared systems that allow users to upload their own configuration files.

All users are urged to upgrade to NetHack 3.6.5 as soon as possible.

Additional information related to this advisory, if any, will be made available at https://nethack.org/security.

Timeline:
27-Jan-2020 NetHack 3.6.5 released with fix.
12-Jan-2020 Bug reported.

Acknowledgements:
The NetHack Development Team gratefully acknowledges security researcher David Mendenhall for discovering this issue and for responsibly reporting it.

Revision History:
27-Jan-2020 Initial Version.

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