Updated Fetchmail packages are available for Red Hat Linux versions 6.2, 7, 7.1, 7.2, 7.3, and 8.0 which close a remotely-exploitable vulnerability in unpatched versions of Fetchmail prior to 6.2.0.
Fetchmail is a remote mail retrieval and forwarding utility intended for use over on-demand TCP/IP links such as SLIP and PPP connections. A bug has been found in the header parsing code in versions of Fetchmail prior to 6.2.0. This bug allows a remote attacker to crash Fetchmail and potentially execute arbitrary code by sending a carefully crafted email which is then parsed by Fetchmail. All users of Fetchmail are advised to upgrade to the errata packages containing a backported fix which corrects this issue.