Technical Description

Two vulnerabilities have been identified in ProFTPD, which could be exploited by attackers to cause a denial of service or execute arbitrary commands.

The first flaw is due to a buffer overflow error in the "cmd_loop()" function [main.c] where the "cmd_buf_size" size of the buffer used to handle FTP commands sent by clients is not properly set to the size configured via the "CommandBufferSize" directive, which could be exploited by attackers to crash a vulnerable application via a specially crafted FTP command.

The second issue is due to a buffer overflow error in the "sreplace() " [support.c] function when processing malformed requests, which could be exploited by a remote attacker to execute arbitrary commands with elevated privileges.

Affected Products

ProFTPD version 1.3.0 and prior

Solution

The first issue has been fixed in CVS :
http://proftp.cvs.sourceforge.net/proftp/proftpd/src/main.c?r1=1.292&r2=1.293&sortby=date

The second issue has been fixed in version 1.3.0a :
http://proftpd.org/download.html

References

http://www.vupen.com/english/advisories/2006/4451
http://bugs.proftpd.org/show_bug.cgi?id=2858

Credits

Vulnerabilities reported by the vendor and Evgeny Legerov

ChangeLog

2006-11-10 : Initial release
2006-11-22 : Updated Description
2006-11-27 : Updated Solution

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