curl: NTLM response buffer overflow

Background

curl is a command line tool for transferring files via many different protocols.

Description

curl fails to properly check boundaries when handling NTLM authentication.

Impact

With a malicious server an attacker could send a carefully crafted NTLM response to a connecting client leading to the execution of arbitrary code with the permissions of the user running curl.

Workaround

Disable NTLM authentication by not using the --anyauth or --ntlm options.

Resolution

All curl users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/curl-7.13.1"