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[INetCop Security Advisory] Snmppd potentially format string vulnerability.
From: "dong-hun you" <xploit () hackermail com>
Date: Mon, 25 Apr 2005 08:06:10 +0800



        ========================================
        INetCop Security Advisory #2005-0x82-027
        ========================================


 Title: Snmppd potentially format string vulnerability.


 0x01. Description

 About:
 snmppd is an SNMP proxy daemon that is designed to work with Nagios.
 It loads MIBs upon startup, listens on a TCP socket for SNMP GET requests,
 polls the specified host, and returns the value to caller process.
 The caller process is usually the Nagios plugin check_snmpp. 

 More detailed information is next URL.

 URL: http://slava.local.nsys.by/projects/snmppd/

 This could happen when program calls wrong syslog() function.
 Using this vulnerability, attacker can get root access remotely.
 But, for this code, it's only possiblity. 
 
 The program uses wrong syslog() ,when option is matched.

 `/snmppd-0.4.5/snmppd/snmppd_util.c':
    --
        ...
    23  void snmppd_log(int level, char *fmt, va_list args)
    24  {
    25      char buffer[2048];
    26      vsnprintf(buffer, 2048, fmt, args);
    27      if (config.debug || config.nofork) {
        ...
    38      } else {
    39          if (level >= LOG_INFO) {
    40              syslog(level, buffer);
    41          }
    42      }
    43  }
        ...
    45  void log_error(char *fmt, ...)
    46  {
        ...
    50      snmppd_log(LOG_ERR, fmt, args);
        ...
    52  }
    53
    54  void log_info(char *fmt, ...)
    55  {
        ...
    59      snmppd_log(LOG_INFO, fmt, args);
        ...
    61  }
    62
    63  void log_debug(char *fmt, ...)
    64  {
        ...
    69          snmppd_log(LOG_DEBUG, fmt, args);
        ...
    72  }
    --

 This code is used as displaied above.
 INetcop Security team hasn't researched whether it is exploitable or not.


 0x02. Vulnerable Packages


 Vendor site: http://bubble.nsys.by/projects/snmppd/

 snmppd all version
 -snmppd-0.4.1.tar.gz
 -snmppd-0.4.2.tar.gz
 -snmppd-0.4.3-special.tar.gz
 -snmppd-0.4.3.tar.gz
 -snmppd-0.4.4.tar.gz
 -snmppd-0.4.5.tar.gz
 -snmppd-0.4.tar.gz
 +Linux


 0x03. Exploit


 There is No exploit for now.


 0x04. Patch


 snmppd 0.4.5 patch:

 === snmppd-0.4.5.patch ===
--- snmppd_util.c       Thu Jul 11 18:52:34 2002
+++ patch/snmppd_util.c Sat Mar  5 23:54:54 2005
@@ -37,7 +37,7 @@
        fputc('\n', stdout);
     } else {
        if (level >= LOG_INFO) {
-           syslog(level, buffer);
+           syslog(level, "%s", buffer);
        }
     }
 }

 === eof ===


 Japan MUST apologize what they have done to all Asian countries during WW2. 
 Eduation is to teach TRUE history to their child.

 History is one thing that CAN NOT be changed.
 Japan should follow German model.

 Germany is also a defeated nation, but they feel deeply sorry for what
 they have done and they teaches the REAL history.

 The history goese on.


 P.S: Sorry, for my poor english.


 --
 By "dong-houn yoU" (Xpl017Elz), in INetCop Security Co., LTD.

 MSN & E-mail: szoahc(at)hotmail(dot)com,
               xploit(at)hackermail(dot)com

 INetCop Security Home: http://www.inetcop.net
              My World: http://x82.inetcop.org

 GPG public key: http://x82.inetcop.org/h0me/pr0file/x82.k3y
 --


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