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wu-ftpd S/KEY authentication overflow

Information

Severity

Severity

Critical

Family

Family

FTP

CVSSv2 Base

CVSSv2 Base

10.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

16 years ago

Modified

Modified

3 years ago

Share

Summary

The remote Wu-FTPd server seems to be vulnerable to a remote overflow.

Insight

Insight

This version contains a remote overflow if s/key support is enabled. The skey_challenge function fails to perform bounds checking on the name variable resulting in a buffer overflow. With a specially crafted request, an attacker can execute arbitrary code resulting in a loss of integrity and/or availability. It appears that this vulnerability may be exploited prior to authentication. It is reported that S/Key support is not enabled by default, though some operating system distributions which ship Wu-Ftpd may have it enabled.

Solution

Solution

Upgrade to Wu-FTPd 2.6.3 when available or disable SKEY or apply the patches available at the referenced vendor homepage.

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Common Vulnerabilities and Exposures (CVE)

References

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