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Date: Fri, 20 Jan 2017 12:15:14 +1030
From: Doran Moppert <>
Subject: CVE Request: two flaws in hesiod permitting privilege elevation

Two flaws in Hesiod reported May 2016 - neither has made it into an
upstream release yet, but one is fixed in trunk and patches are
available for both.

Note that glibc is not affected by either of these issues.

Originally reported by Florian Weimer.

# Weak SUID check allowing privilege elevation

Hesiod unsafely checks EUID vs UID in a few places, consulting
environment variables for configuration if they match.  This could be
used for privilege elevation under some circumstances.  The fix uses
secure_getenv() in place of getenv().

# Use of hard-coded DNS domain if configuration file cannot be read

If opening the configuration file fails, hesiod falls back on a default
domain "" to retrieve managed information.  A local
attacker with the opportunity to poison DNS cache could potentially
elevate their privileges to root by causing fopen() to fail.


Doran Moppert
Red Hat Product Security

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