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BNC: Input validation flaw


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200410-13 / bnc
Release Date October 15, 2004
Latest Revision May 22, 2006: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-irc/bnc < 2.8.9 >= 2.8.9 All supported architectures

Related bugreports: #66912


BNC contains an input validation flaw which might allow a remote attacker to issue arbitrary IRC related commands.

2.  Impact Information


BNC is an IRC proxying server


A flaw exists in the input parsing of BNC where part of the sbuf_getmsg() function handles the backspace character incorrectly.


A remote user could issue commands using fake authentication credentials and possibly gain access to scripts running on the client side.

3.  Resolution Information


There is no known workaround at this time.


All BNC users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge sync

# emerge -pv ">=net-irc/bnc-2.8.9"
# emerge ">=net-irc/bnc-2.8.9"

4.  References


Page updated October 15, 2004

Summary: This is a Gentoo Linux Security Advisory

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