Vulnerability Assessment & Network Security Forums
If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
NetKit-telnetd: buffer overflows in telnet and telnetd
Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200410-03
(NetKit-telnetd: buffer overflows in telnet and telnetd)
A possible buffer overflow exists in the parsing of option strings by the
telnet daemon, where proper bounds checking is not applied when writing to
a buffer. Additionaly, another possible buffer overflow has been found by
Josh Martin in the handling of the environment variable HOME.
A remote attacker sending a specially-crafted options string to the telnet
daemon could be able to run arbitrary code with the rights of the user
running the telnet daemon, usually root. Furthermore, a possible hacker could
make use of an overlong HOME variable to cause a buffer overflow in the
telnet client, potentially leading to the local execution of arbitrary
There is no known workaround at this time.
All NetKit-telnetd users should upgrade to the latest version:
# emerge sync
# emerge -pv ">=net-misc/netkit-telnetd-0.17-r4"
# emerge ">=net-misc/netkit-telnetd-0.17-r4"
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: (C) 2005 Michel Arboi
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