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Gentoo Linux Security Advisory GLSA 200410-03 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: NetKit-telnetd: buffer overflows in telnet and telnetd |
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Date: October 05, 2004 |
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Bugs: #64632 |
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ID: 200410-03 |
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Synopsis |
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======== |
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|
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Buffer overflows exist in the telnet client and daemon provided by |
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netkit-telnetd, which could possibly allow a remote attacker to gain |
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root privileges and compromise the system. |
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|
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Background |
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========== |
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|
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NetKit-telnetd is a standard Linux telnet client and server from the |
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NetKit utilities. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-misc/netkit-telnetd <= 0.17-r3 >= 0.17-r4 |
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|
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Description |
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=========== |
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|
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A possible buffer overflow exists in the parsing of option strings by |
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the telnet daemon, where proper bounds checking is not applied when |
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writing to a buffer. Additionaly, another possible buffer overflow has |
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been found by Josh Martin in the handling of the environment variable |
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HOME. |
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|
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Impact |
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====== |
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|
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A remote attacker sending a specially-crafted options string to the |
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telnet daemon could be able to run arbitrary code with the privileges |
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of the user running the telnet daemon, usually root. Furthermore, an |
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attacker could make use of an overlong HOME variable to cause a buffer |
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overflow in the telnet client, potentially leading to the local |
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execution of arbitrary code. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All NetKit-telnetd users should upgrade to the latest version: |
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# emerge sync |
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# emerge -pv ">=net-misc/netkit-telnetd-0.17-r4" |
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# emerge ">=net-misc/netkit-telnetd-0.17-r4" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2001-0554 |
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http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2001-0554 |
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[ 2 ] Debian Bug #264846 |
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http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=264846 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200410-03.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2004 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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http://creativecommons.org/licenses/by-sa/1.0 |
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