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ez-ipupdate show_message() Format String
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SUMMARY
<http://www.ez-ip.net/> ez-ipupdate is "a complete client for the dynamic
DNS service". The a format string vulnerability in ez-ipupdate allows a
malicious remote DNS server to cause the program to execute arbitrary
code.
DETAILS
Vulnerable Systems:
* ez-ipupdate versions 3.0.11b8, 3.0.11b7, 3.0.11b6, 3.0.11b5 and 3.0.10
Immune Systems:
* ez-ipupdate version 2.9.6
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0980.>
CAN-2004-0980.
The format string bug allows a malicious remote server to execute
arbitrary code on the machine running ez-ipupdate, if and only if the
daemon mode is on (very common) and certain service types are used.
Unofficial patch:
--- ez-ipupdate.c.old 2002-03-12 00:31:47.000000000 +0100
+++ ez-ipupdate.c 2004-11-10 15:28:23.000000000 +0100
@@ -798,7 +798,7 @@ void show_message(char *fmt, ...)
sprintf(buf, "message incomplete because your OS sucks: %s\n", fmt);
#endif
- syslog(LOG_NOTICE, buf);
+ syslog(LOG_NOTICE, "%s", buf);
}
else
{
ADDITIONAL INFORMATION
The information has been provided by
<mailto:Ulf.Harnhammar.9485@student.uu.se> Ulf H rnhammar.
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