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UnrealIRCd: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 201006-21 / unrealircd
Release Date June 14, 2010
Latest Revision June 14, 2010: 02
Impact high
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-irc/unrealircd < >= All supported architectures

Related bugreports: #260806, #323691


Multiple vulnerabilities in UnrealIRCd might allow remote attackers to compromise the "unrealircd" account, or cause a Denial of Service.

2.  Impact Information


UnrealIRCd is an Internet Relay Chat (IRC) daemon.


Multiple vulnerabilities have been reported in UnrealIRCd:

  • The vendor reported a buffer overflow in the user authorization code (CVE-2009-4893).
  • The vendor reported that the distributed source code of UnrealIRCd was compromised and altered to include a system() call that could be called with arbitrary user input (CVE-2010-2075).


A remote attacker could exploit these vulnerabilities to cause the execution of arbitrary commands with the privileges of the user running UnrealIRCd, or a Denial of Service condition. NOTE: By default UnrealIRCd on Gentoo is run with the privileges of the "unrealircd" user.

3.  Resolution Information


There is no known workaround at this time.


All UnrealIRCd users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-irc/unrealircd-"

4.  References


Page updated June 14, 2010

Summary: This is a Gentoo Linux Security Advisory

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