Title: Multiple Vendor Wu-Ftpd Buffer Overflow Vulnerability
Severity: CRITICAL
Description:
There is a buffer overflow vulnerability present in versions of wu-ftpd 2.5 and below (and its derivatives). It is similar to the previous wu-ftpd bug, being related to path and path translation. The static array mapped_path is copied into a local buffer on the stack without bounds checking, allowing overflowing of the buffer and the execution of arbitrary code (as root). Systems running the vulnerable versions of wu-ftpd allowing anonymous access with writeable directories (ie. incoming) are especially vulnerable. The consequence is a possible remote root compromise through anonymous ftp (if enabled), or an almost guaranteed remote root compromise through a known user account/password.
The code in question defines the function 'getcwd' to be 'mapped_path_cwd'. The mapped_path_cwd does not perform bounsd checking. When an FTP client sensd a CWD command the 'pwd' function is called which in turn calls 'getcwd' passing it a buffer in the stack of length MAXPATHLEN + 1.
Affected Products:
- BeroFTPD BeroFTPD 1.3.2
- BeroFTPD BeroFTPD 1.3.3
- BeroFTPD BeroFTPD 1.3.4
- Caldera OpenLinux 2.4.0
- Caldera OpenLinux Desktop 2.3.0
- Linux ftpd 0.16.0
- RedHat Linux 6.0.0
- RedHat Linux 6.0.0 alpha
- RedHat Linux 6.0.0 sparc
- SCO eDesktop 2.4.0
- SCO eServer 2.3.0
- SCO eServer 2.3.1
- Washington University wu-ftpd 2.4.2 (beta 18) VR10
- Washington University wu-ftpd 2.4.2 (beta 18) VR11
- Washington University wu-ftpd 2.4.2 (beta 18) VR12
- Washington University wu-ftpd 2.4.2 (beta 18) VR13
- Washington University wu-ftpd 2.4.2 (beta 18) VR14
- Washington University wu-ftpd 2.4.2 (beta 18) VR15
- Washington University wu-ftpd 2.4.2 (beta 18) VR4
- Washington University wu-ftpd 2.4.2 (beta 18) VR5
- Washington University wu-ftpd 2.4.2 (beta 18) VR6
- Washington University wu-ftpd 2.4.2 (beta 18) VR7
- Washington University wu-ftpd 2.4.2 (beta 18) VR8
- Washington University wu-ftpd 2.4.2 (beta 18) VR9
- Washington University wu-ftpd 2.4.2 VR16
- Washington University wu-ftpd 2.4.2 VR17
- Washington University wu-ftpd 2.5.0 .0
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