[UNIX] ssmtp Insecure File Creation
From: SecuriTeam (support_at_securiteam.com)
Date: 05/02/04
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To: list@securiteam.com Date: 2 May 2004 11:27:43 +0200
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ssmtp Insecure File Creation
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SUMMARY
<http://packages.debian.org/stable/mail/ssmtp.html> ssmtp is "A secure,
effective and simple way of getting mail off a system to your mail hub. It
contains no suid-binaries or other dangerous things - no mail spool to
poke around in, and no daemons running in the background. Mail is simply
forwarded to the configured mailhost. Extremely easy configuration."
Due to a problem in how ssmtp creates its log file, an attacker is able to
overwrite any arbitrary file on the system, with privileges equal to those
of the ssmtp server (usually root).
DETAILS
Vulnerable Systems:
* ssmtp version 2.50.6
The server creates a log file at /tmp/ssmtp.log, the contents of which can
be specified by the user. Due to a bug in the code, an attacker is able to
overwrite files on the target machine.
The vulnerable call is in log_event:
#ifdef LOGFILE
if((fp = fopen("/tmp/ssmtp.log", "a")) != (FILE *)NULL) {
(void)fprintf(fp, "%s\\n", buf);
(void)fclose(fp);
ADDITIONAL INFORMATION
The information has been provided by <mailto:priestmaster@sms.at> Priest.
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