BNC: Input validation flaw

1. Gentoo Linux Security Advisory

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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