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TITLE:
wzdftpd "do_login_loop()" Off-By-One Vulnerability

SECUNIA ADVISORY ID:
SA27091

VERIFY ADVISORY:
http://secunia.com/advisories/27091/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
wzdftpd 0.x
http://secunia.com/product/1799/

DESCRIPTION:
k1tk4t has discovered a vulnerability in wzdftpd, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
potentially to compromise a vulnerable system.

The vulnerability is caused due to an off-by-one error within the
"do_login_loop()" function in libwzd-core/wzd_login.c. This can be
exploited to cause a stack-based buffer overflow with a zero byte by
sending an overly long string to the affected server (over 4095
bytes).

The vulnerability is confirmed in version 0.8.2. Other versions may
also be affected.

SOLUTION:
Restrict access to the affected server.

PROVIDED AND/OR DISCOVERED BY:
k1tk4t

ORIGINAL ADVISORY:
http://milw0rm.com/exploits/4498

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