Bug#1017579: Freeciv < 2.6.7, freeciv-3.0 < 3.0.3, Modpack Installer buffer overflow

[Moritz Muehlenhoff]

Source: freeciv
Version: 2.6.6-1
Severity: grave
Tags: security
X-Debbugs-Cc: Debian Security Team <team at security.debian.org>

Quoting from the announcement posted to oss-security (no CVE is
available):

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 Just released freeciv-2.6.7 & freeciv-3.0.3 fix buffer overflow in
 Modpack Installer utility's handling of the modpack URL. Specially
 crafted URLs, without any '/' -characters would result in an
 underflowing length (unsigned)(-1) string copy, i.e., all of the
 NULL-terminated string given as "URL" would get written beyond the
 buffer reserved for it.

 Freeciv source tarballs are available from
 https://www.freeciv.org/download.html for current 3.0, and from
 https://www.freeciv.org/wiki/Old_downloads for 2.6.

 In case you can't make full version update at the moment, bug tracker
 ticket has also a patch for this single issue attached:
 https://osdn.net/projects/freeciv/ticket/45299
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