Secunia Security Advisory - dmnt has discovered two vulnerabilities in Serv-U, which can be exploited by malicious users to cause a DoS (Denial of Service) or compromise a vulnerable system.
8ae2c5607ab9b3e3303853bfc8864035f8f1b8b3fc5f89a8ede6530968f3e081
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TITLE:
Serv-U File Renaming Directory Traversal and STOU Denial of Service
SECUNIA ADVISORY ID:
SA32150
VERIFY ADVISORY:
http://secunia.com/advisories/32150/
CRITICAL:
Moderately critical
IMPACT:
DoS, System access
WHERE:
>From remote
SOFTWARE:
Serv-U File Server 7.x
http://secunia.com/advisories/product/19573/
DESCRIPTION:
dmnt has discovered two vulnerabilities in Serv-U, which can be
exploited by malicious users to cause a DoS (Denial of Service) or
compromise a vulnerable system.
1) An error in the handling of the "STOU" FTP command can be
exploited to exhaust available CPU resources via a specially crafted
argument (e.g. "CON:1").
2) An input validation error in the FTP service when renaming files
can be exploited to overwrite or create arbitrary files with
user-supplied content via directory traversal attacks.
The vulnerabilities are confirmed in version 7.3.0.0. Other versions
may also be affected.
SOLUTION:
Restrict access to the FTP service.
PROVIDED AND/OR DISCOVERED BY:
dmnt
ORIGINAL ADVISORY:
http://milw0rm.com/exploits/6660
http://milw0rm.com/exploits/6661
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