Eggdrop/Windrop 1.6.19 - ctcpbuf Remote Crash

eggdrop/windrop remote crash vulnerability



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From: Thomas Sader <thommey_at_gmail.com>

Date: Fri, 15 May 2009 05:54:08 +0200



Affected software

-----------------



eggdrop (1.6.19 only, not 1.6.19+ctcpfix)

windrop (1.6.19 only, not 1.6.19+ctcpfix)

all eggdrop/windrop versions and packages which apply Nico Goldes

patch for CVE-2007-2807/SA25276 See: [1]



Vulnerability details

---------------------



The SA25276 patch ([1]) uses strncpy to fix a buffer overflow vulnerability

in src/mod/server.mod/servmsg.c (gotmsg). The last argument is not checked

for being non-negative, but that can happen if ctcpbuf is "". That causes

a remote crash vulnerability to be exploited by anyone connected to the same

IRC network as eggdrop. The SA25276 patch has been applied to the eggdrop1.6.18

debian package and was later adopted by Eggheads into eggdrop1.6.19.



One possible exploit anyone can send to the IRC server to crash eggdrop:



PRIVMSG eggdrop :\1\1



Resolution

----------



Upgrade to eggdrop/windrop 1.6.19+ctcpfix ([2],[3]), the current cvs versions,

or apply the ctcpfix patch at [2] before compiling.



Disclosure timeline

-------------------



2009-05-06: Vulnerability discovered and reported to Eggheads.

2009-05-06: Patch committed to cvs.

2009-05-14: New eggdrop and windrop version released with the fix applied.

2009-05-14: Public disclosure.



References

----------



[1] http://bugzilla.eggheads.org/show_bug.cgi?id=462

    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=427157

    http://www.securityfocus.com/bid/24070

    http://secunia.com/advisories/25276

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2807



[2] http://www.eggheads.org/downloads/

[3] http://windrop.sourceforge.net/downloads.html



---

Thomas Sader (thommey)



# milw0rm.com [2009-05-15]