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Title: Multiple Vendor Telnet Client Env_opt_add Heap-Based Buffer Overflow Vulnerability

Severity: HIGH

Description:

Multiple vendor's Telnet client applications are reported prone to a remote buffer-overflow vulnerability. This vulnerability reportedly occurs in the 'env_opt_add()' function in the 'telnet.c' source file, which is apparently common source for all the affected vendors.

The vulnerability occurs when the affected function handles bad Telnet network data received from a malicious Telnet server. Specifically, when certain unspecified characters that require escaping by the Telnet protocol are processed, this can result in the data being expanded into an insufficient heap-based memory buffer. Superfluous data that results from the escaping operation corrupts heap-based memory that resides adjacent to the affected buffer.

A remote attacker may exploit this vulnerability to execute arbitrary code on some of the affected platforms in the context of a user that is using the vulnerable Telnet client to connect to a malicious server.

Affected Products:

• ALT Linux ALT Linux Compact 2.3.0
• ALT Linux ALT Linux Junior 2.3.0
• Apple Mac OS X 10.0.0
• Apple Mac OS X 10.0.03
• Apple Mac OS X 10.0.1
• Apple Mac OS X 10.0.2
• Apple Mac OS X 10.0.3
• Apple Mac OS X 10.0.4
• Apple Mac OS X 10.1.0
• Apple Mac OS X 10.1.0
• Apple Mac OS X 10.1.1
• Apple Mac OS X 10.1.2
• Apple Mac OS X 10.1.3
• Apple Mac OS X 10.1.4
• Apple Mac OS X 10.1.5
• Apple Mac OS X 10.2.0
• Apple Mac OS X 10.2.1
• Apple Mac OS X 10.2.2
• Apple Mac OS X 10.2.3
• Apple Mac OS X 10.2.4
• Apple Mac OS X 10.2.5
• Apple Mac OS X 10.2.6
• Apple Mac OS X 10.2.7
• Apple Mac OS X 10.2.8
• Apple Mac OS X 10.3.0
• Apple Mac OS X 10.3.1
• Apple Mac OS X 10.3.2
• Apple Mac OS X 10.3.3
• Apple Mac OS X 10.3.4
• Apple Mac OS X 10.3.5
• Apple Mac OS X 10.3.6
• Apple Mac OS X 10.3.7
• Apple Mac OS X 10.3.8
• Apple Mac OS X Server 10.0.0
• Apple Mac OS X Server 10.1.0
• Apple Mac OS X Server 10.1.1
• Apple Mac OS X Server 10.1.2
• Apple Mac OS X Server 10.1.3
• Apple Mac OS X Server 10.1.4
• Apple Mac OS X Server 10.1.5
• Apple Mac OS X Server 10.2.0
• Apple Mac OS X Server 10.2.1
• Apple Mac OS X Server 10.2.2
• Apple Mac OS X Server 10.2.3
• Apple Mac OS X Server 10.2.4
• Apple Mac OS X Server 10.2.5
• Apple Mac OS X Server 10.2.6
• Apple Mac OS X Server 10.2.7
• Apple Mac OS X Server 10.2.8
• Apple Mac OS X Server 10.3.0
• Apple Mac OS X Server 10.3.1
• Apple Mac OS X Server 10.3.2
• Apple Mac OS X Server 10.3.3
• Apple Mac OS X Server 10.3.4
• Apple Mac OS X Server 10.3.5
• Apple Mac OS X Server 10.3.6
• Apple Mac OS X Server 10.3.7
• Apple Mac OS X Server 10.3.8
• Avaya CVLAN
• Avaya Converged Communications Server 2.0.0
• Avaya Intuity LX
• Avaya MN100
• Avaya Modular Messaging (MSS) 1.1.0
• Avaya Modular Messaging (MSS) 2.0.0
• Avaya Modular Messaging S3400
• Avaya S8300 R2.0.0
• Avaya S8300 R2.0.1
• Avaya S8500 R2.0.0
• Avaya S8500 R2.0.1
• Avaya S8700 R2.0.0
• Avaya S8700 R2.0.1
• Avaya S8710 R2.0.0
• Avaya S8710 R2.0.1
• Caldera OpenLinux 2.3.0
• Caldera OpenLinux 2.4.0
• Conectiva Linux 10.0.0
• Conectiva Linux 8.0.0
• Conectiva Linux 9.0.0
• Debian Linux 2.2.0
• Debian Linux 2.2.0 68k
• Debian Linux 2.2.0 alpha
• Debian Linux 2.2.0 arm
• Debian Linux 2.2.0 powerpc
• Debian Linux 2.2.0 sparc
• Debian Linux 3.0.0
• Debian Linux 3.0.0 alpha
• Debian Linux 3.0.0 arm
• Debian Linux 3.0.0 hppa
• Debian Linux 3.0.0 ia-32
• Debian Linux 3.0.0 ia-64
• Debian Linux 3.0.0 m68k
• Debian Linux 3.0.0 mips
• Debian Linux 3.0.0 mipsel
• Debian Linux 3.0.0 ppc
• Debian Linux 3.0.0 s/390
• Debian Linux 3.0.0 sparc
• F5 3-DNS 4.2.0
• F5 3-DNS 4.3.0
• F5 3-DNS 4.4.0
• F5 3-DNS 4.5.0
• F5 3-DNS 4.5.11
• F5 3-DNS 4.5.12
• F5 3-DNS 4.6.0
• F5 3-DNS 4.6.2
• F5 BigIP 4.0.0
• F5 BigIP 4.2.0
• F5 BigIP 4.3.0
• F5 BigIP 4.4.0
• F5 BigIP 4.5.0
• F5 BigIP 4.5.10
• F5 BigIP 4.5.11
• F5 BigIP 4.5.12
• F5 BigIP 4.5.6
• F5 BigIP 4.5.9
• F5 BigIP 4.6.0
• F5 BigIP 4.6.2
• FreeBSD FreeBSD 4.0.0
• FreeBSD FreeBSD 4.0.0 -RELENG
• FreeBSD FreeBSD 4.0.0 .x
• FreeBSD FreeBSD 4.0.0 alpha
• FreeBSD FreeBSD 4.1.0
• FreeBSD FreeBSD 4.1.1
• FreeBSD FreeBSD 4.1.1 -RELEASE
• FreeBSD FreeBSD 4.1.1 -STABLE
• FreeBSD FreeBSD 4.10.0
• FreeBSD FreeBSD 4.10.0 -RELEASE
• FreeBSD FreeBSD 4.10.0 -RELENG
• FreeBSD FreeBSD 4.11.0 -STABLE
• FreeBSD FreeBSD 4.2.0
• FreeBSD FreeBSD 4.2.0 -RELEASE
• FreeBSD FreeBSD 4.2.0 -STABLE
• FreeBSD FreeBSD 4.2.0 -STABLEpre050201
• FreeBSD FreeBSD 4.2.0 -STABLEpre122300
• FreeBSD FreeBSD 4.3.0
• FreeBSD FreeBSD 4.3.0 -RELEASE
• FreeBSD FreeBSD 4.3.0 -RELEASE-p38
• FreeBSD FreeBSD 4.3.0 -RELENG
• FreeBSD FreeBSD 4.3.0 -STABLE
• FreeBSD FreeBSD 4.4.0
• FreeBSD FreeBSD 4.4.0 -RELEASE-p42
• FreeBSD FreeBSD 4.4.0 -RELENG
• FreeBSD FreeBSD 4.4.0 -RELENG
• FreeBSD FreeBSD 4.4.0 -STABLE
• FreeBSD FreeBSD 4.5.0
• FreeBSD FreeBSD 4.5.0 -RELEASE
• FreeBSD FreeBSD 4.5.0 -RELEASE-p32
• FreeBSD FreeBSD 4.5.0 -RELENG
• FreeBSD FreeBSD 4.5.0 -STABLE
• FreeBSD FreeBSD 4.5.0 -STABLEpre2002-03-07
• FreeBSD FreeBSD 4.6.0
• FreeBSD FreeBSD 4.6.0 -RELEASE
• FreeBSD FreeBSD 4.6.0 -RELEASE-p20
• FreeBSD FreeBSD 4.6.0 -RELENG
• FreeBSD FreeBSD 4.6.0 -STABLE
• FreeBSD FreeBSD 4.6.2
• FreeBSD FreeBSD 4.7.0
• FreeBSD FreeBSD 4.7.0 -RELEASE
• FreeBSD FreeBSD 4.7.0 -RELEASE-p17
• FreeBSD FreeBSD 4.7.0 -RELENG
• FreeBSD FreeBSD 4.7.0 -STABLE
• FreeBSD FreeBSD 4.8.0
• FreeBSD FreeBSD 4.8.0 -PRERELEASE
• FreeBSD FreeBSD 4.8.0 -RELEASE-p7
• FreeBSD FreeBSD 4.8.0 -RELENG
• FreeBSD FreeBSD 4.9.0
• FreeBSD FreeBSD 4.9.0 -PRERELEASE
• FreeBSD FreeBSD 4.9.0 -RELENG
• FreeBSD FreeBSD 5.0.0
• FreeBSD FreeBSD 5.0.0 -RELEASE-p14
• FreeBSD FreeBSD 5.0.0 -RELENG
• FreeBSD FreeBSD 5.0.0 alpha
• FreeBSD FreeBSD 5.1.0
• FreeBSD FreeBSD 5.1.0 -RELEASE
• FreeBSD FreeBSD 5.1.0 -RELEASE-p5
• FreeBSD FreeBSD 5.1.0 -RELEASE/Alpha
• FreeBSD FreeBSD 5.1.0 -RELENG
• FreeBSD FreeBSD 5.2.0
• FreeBSD FreeBSD 5.2.0 -RELEASE
• FreeBSD FreeBSD 5.2.0 -RELENG
• FreeBSD FreeBSD 5.2.1 -RELEASE
• FreeBSD FreeBSD 5.3.0
• FreeBSD FreeBSD 5.3.0 -RELEASE
• FreeBSD FreeBSD 5.3.0 -STABLE
• FreeBSD FreeBSD 5.4.0 -PRERELEASE
• Gentoo Linux
• Heimdal Heimdal 0.5.0.0
• Heimdal Heimdal 0.5.1
• Heimdal Heimdal 0.5.2
• Heimdal Heimdal 0.5.3
• Heimdal Heimdal 0.6.0
• Heimdal Heimdal 0.6.1
• Heimdal Heimdal 0.6.2
• Heimdal Heimdal 0.6.3
• Linux kernel 2.4.19
• Linux kernel 2.4.21
• Linux kernel 2.4.4
• Linux kernel 2.6.5
• MIT Kerberos 5 1.0.0
• MIT Kerberos 5 1.0.6
• MIT Kerberos 5 1.0.8
• MIT Kerberos 5 1.1.0
• MIT Kerberos 5 1.1.1
• MIT Kerberos 5 1.2.0
• MIT Kerberos 5 1.2.1
• MIT Kerberos 5 1.2.2
• MIT Kerberos 5 1.2.2 -beta1
• MIT Kerberos 5 1.2.3
• MIT Kerberos 5 1.2.4
• MIT Kerberos 5 1.2.5
• MIT Kerberos 5 1.2.6
• MIT Kerberos 5 1.2.7
• MIT Kerberos 5 1.2.8
• MIT Kerberos 5 1.3.0
• MIT Kerberos 5 1.3.0 -alpha1
• MIT Kerberos 5 1.3.1
• MIT Kerberos 5 1.3.2
• MIT Kerberos 5 1.3.3
• MIT Kerberos 5 1.3.4
• MIT Kerberos 5 1.3.5
• MIT Kerberos 5 1.3.6
• MIT Kerberos 5 1.4.0
• MandrakeSoft Corporate Server 2.1.0
• MandrakeSoft Corporate Server 2.1.0 x86_64
• MandrakeSoft Linux Mandrake 10.0.0
• MandrakeSoft Linux Mandrake 10.0.0 amd64
• MandrakeSoft Linux Mandrake 10.1.0
• MandrakeSoft Linux Mandrake 10.1.0 x86_64
• MandrakeSoft Linux Mandrake 8.1.0
• MandrakeSoft Linux Mandrake 8.1.0 ia64
• MandrakeSoft Linux Mandrake 8.2.0
• MandrakeSoft Linux Mandrake 8.2.0 ppc
• MandrakeSoft Linux Mandrake 9.0.0
• MandrakeSoft Linux Mandrake 9.1.0
• MandrakeSoft Linux Mandrake 9.1.0 ppc
• MandrakeSoft Linux Mandrake 9.2.0
• MandrakeSoft Linux Mandrake 9.2.0 amd64
• MandrakeSoft Multi Network Firewall 2.0.0
• NetBSD NetBSD 2.0.0
• NetBSD NetBSD 2.0.1
• NetBSD NetBSD 2.0.2
• Netkit Linux Netkit 0.10.0
• Netkit Linux Netkit 0.11.0
• Netkit Linux Netkit 0.12.0
• Netkit Linux Netkit 0.14.0
• Netkit Linux Netkit 0.15.0
• Netkit Linux Netkit 0.16.0
• Netkit Linux Netkit 0.17.0
• Netkit Linux Netkit 0.17.17
• Netkit Linux Netkit 0.9.0
• OpenBSD OpenBSD 3.1
• OpenBSD OpenBSD 3.2
• OpenBSD OpenBSD 3.5.0
• OpenBSD OpenBSD 3.6
• Openwall Openwall GNU/*/Linux (Owl)-current
• Openwall Openwall GNU/*/Linux 1.0.0
• Openwall Openwall GNU/*/Linux 1.1.0
• RedHat Advanced Workstation for the Itanium Processor 2.1.0
• RedHat Advanced Workstation for the Itanium Processor 2.1.0 IA64
• RedHat Desktop 3.0.0
• RedHat Desktop 4.0.0
• RedHat Enterprise Linux AS 2.1
• RedHat Enterprise Linux AS 2.1 IA64
• RedHat Enterprise Linux AS 3
• RedHat Enterprise Linux AS 4
• RedHat Enterprise Linux ES 2.1
• RedHat Enterprise Linux ES 2.1 IA64
• RedHat Enterprise Linux ES 3
• RedHat Enterprise Linux ES 4
• RedHat Enterprise Linux WS 2.1
• RedHat Enterprise Linux WS 2.1 IA64
• RedHat Enterprise Linux WS 3
• RedHat Enterprise Linux WS 4
• RedHat Fedora Core1
• RedHat Fedora Core2
• RedHat Fedora Core3
• RedHat Linux 5.2.0
• RedHat Linux 5.2.0 alpha
• RedHat Linux 5.2.0 i386
• RedHat Linux 5.2.0 sparc
• RedHat Linux 6.2.0
• RedHat Linux 6.2.0 alpha
• RedHat Linux 6.2.0 i386
• RedHat Linux 6.2.0 sparc
• RedHat Linux 7.0.0
• RedHat Linux 7.0.0 alpha
• RedHat Linux 7.0.0 i386
• RedHat Linux 7.0.0 sparc
• RedHat Linux 7.1.0
• RedHat Linux 7.1.0 alpha
• RedHat Linux 7.1.0 i386
• RedHat Linux 7.1.0 ia64
• RedHat Linux 7.2.0
• RedHat Linux 7.2.0 i386
• RedHat Linux 7.2.0 ia64
• RedHat Linux 7.3.0
• RedHat Linux 7.3.0 i386
• RedHat Linux 7.3.0 i686
• RedHat Linux 8.0.0
• RedHat Linux 8.0.0 i386
• RedHat Linux 9.0.0 i386
• S.u.S.E. Linux 7.0.0
• S.u.S.E. Linux 7.0.0 alpha
• S.u.S.E. Linux 7.0.0 i386
• S.u.S.E. Linux 7.0.0 ppc
• S.u.S.E. Linux 7.0.0 sparc
• S.u.S.E. Linux 7.1.0
• S.u.S.E. Linux 7.1.0 alpha
• S.u.S.E. Linux 7.1.0 ppc
• S.u.S.E. Linux 7.1.0 sparc
• S.u.S.E. Linux 7.1.0 x86
• S.u.S.E. Linux 7.2.0
• S.u.S.E. Linux 7.2.0 i386
• S.u.S.E. Linux 7.3.0
• S.u.S.E. Linux 7.3.0 i386
• S.u.S.E. Linux 7.3.0 ppc
• S.u.S.E. Linux 7.3.0 sparc
• S.u.S.E. Linux 8.0.0
• S.u.S.E. Linux 8.0.0 i386
• S.u.S.E. Linux 8.1.0
• S.u.S.E. Linux Desktop 1.0.0
• S.u.S.E. Linux Enterprise Server 7
• S.u.S.E. Linux Enterprise Server 8
• S.u.S.E. Linux Enterprise Server 9
• S.u.S.E. Linux Enterprise Server for S/390 9.0.0
• S.u.S.E. Linux Personal 8.2.0
• S.u.S.E. Linux Personal 9.0.0
• S.u.S.E. Linux Personal 9.0.0 x86_64
• S.u.S.E. Linux Personal 9.1.0
• S.u.S.E. Linux Personal 9.1.0 x86_64
• S.u.S.E. Linux Personal 9.2.0
• S.u.S.E. Linux Personal 9.2.0 x86_64
• SCO Open Server 5.0.6
• SCO Open Server 5.0.7
• SCO Unixware 7.1.1
• SCO Unixware 7.1.3
• SCO Unixware 7.1.4
• SCO eDesktop 2.4.0
• SCO eServer 2.3.1
• SGI IRIX 3.2.0
• SGI IRIX 3.3.0
• SGI IRIX 3.3.1
• SGI IRIX 3.3.2
• SGI IRIX 3.3.3
• SGI IRIX 4.0.0
• SGI IRIX 4.0.1
• SGI IRIX 4.0.1 T
• SGI IRIX 4.0.2
• SGI IRIX 4.0.3
• SGI IRIX 4.0.4
• SGI IRIX 4.0.4 B
• SGI IRIX 4.0.4 T
• SGI IRIX 4.0.5
• SGI IRIX 4.0.5 (IOP)
• SGI IRIX 4.0.5 A
• SGI IRIX 4.0.5 D
• SGI IRIX 4.0.5 E
• SGI IRIX 4.0.5 F
• SGI IRIX 4.0.5 G
• SGI IRIX 4.0.5 H
• SGI IRIX 4.0.5 IPR
• SGI IRIX 5.0.0
• SGI IRIX 5.0.1
• SGI IRIX 5.1.0
• SGI IRIX 5.1.1
• SGI IRIX 5.2.0
• SGI IRIX 5.3.0
• SGI IRIX 5.3.0 XFS
• SGI IRIX 6.0.0
• SGI IRIX 6.0.1
• SGI IRIX 6.0.1 XFS
• SGI IRIX 6.1.0
• SGI IRIX 6.2.0
• SGI IRIX 6.3.0
• SGI IRIX 6.4.0
• SGI IRIX 6.5.0
• SGI IRIX 6.5.0.19f
• SGI IRIX 6.5.0.19m
• SGI IRIX 6.5.020
• SGI IRIX 6.5.1
• SGI IRIX 6.5.10
• SGI IRIX 6.5.10f
• SGI IRIX 6.5.10m
• SGI IRIX 6.5.11
• SGI IRIX 6.5.11f
• SGI IRIX 6.5.11m
• SGI IRIX 6.5.12
• SGI IRIX 6.5.12 f
• SGI IRIX 6.5.12 m
• SGI IRIX 6.5.13
• SGI IRIX 6.5.13 f
• SGI IRIX 6.5.13 m
• SGI IRIX 6.5.14
• SGI IRIX 6.5.14 f
• SGI IRIX 6.5.14 m
• SGI IRIX 6.5.15
• SGI IRIX 6.5.15f
• SGI IRIX 6.5.15m
• SGI IRIX 6.5.16
• SGI IRIX 6.5.16f
• SGI IRIX 6.5.16m
• SGI IRIX 6.5.17
• SGI IRIX 6.5.17f
• SGI IRIX 6.5.17m
• SGI IRIX 6.5.18
• SGI IRIX 6.5.18f
• SGI IRIX 6.5.18m
• SGI IRIX 6.5.19
• SGI IRIX 6.5.19f
• SGI IRIX 6.5.19m
• SGI IRIX 6.5.2
• SGI IRIX 6.5.20
• SGI IRIX 6.5.20 f
• SGI IRIX 6.5.20 m
• SGI IRIX 6.5.21
• SGI IRIX 6.5.21 f
• SGI IRIX 6.5.21 m
• SGI IRIX 6.5.22
• SGI IRIX 6.5.22 m
• SGI IRIX 6.5.23
• SGI IRIX 6.5.23 m
• SGI IRIX 6.5.24
• SGI IRIX 6.5.24 m
• SGI IRIX 6.5.25
• SGI IRIX 6.5.26
• SGI IRIX 6.5.27
• SGI IRIX 6.5.2f
• SGI IRIX 6.5.2m
• SGI IRIX 6.5.3
• SGI IRIX 6.5.3f
• SGI IRIX 6.5.3m
• SGI IRIX 6.5.4
• SGI IRIX 6.5.4f
• SGI IRIX 6.5.4m
• SGI IRIX 6.5.5
• SGI IRIX 6.5.5f
• SGI IRIX 6.5.5m
• SGI IRIX 6.5.6
• SGI IRIX 6.5.6f
• SGI IRIX 6.5.6m
• SGI IRIX 6.5.7
• SGI IRIX 6.5.7f
• SGI IRIX 6.5.7m
• SGI IRIX 6.5.8
• SGI IRIX 6.5.8f
• SGI IRIX 6.5.8m
• SGI IRIX 6.5.9
• SGI IRIX 6.5.9f
• SGI IRIX 6.5.9m
• SGI ProPack 3.0.0
• Slackware Linux -current
• Slackware Linux 10.0.0
• Slackware Linux 10.1.0
• Slackware Linux 8.1.0
• Slackware Linux 9.0.0
• Slackware Linux 9.1.0
• Sun SEAM 1.0.0
• Sun SEAM 1.0.1
• Sun SEAM 1.0.2
• Sun Solaris 10
• Sun Solaris 2.6
• Sun Solaris 2.6_x86
• Sun Solaris 7.0
• Sun Solaris 7.0_x86
• Sun Solaris 8
• Sun Solaris 8_x86
• Sun Solaris 9
• Sun Solaris 9_x86
• Sun Solaris 9_x86 Update 2
• Trustix Secure Enterprise Linux 2.0.0
• Trustix Secure Linux 2.1.0
• Trustix Secure Linux 2.2.0
• Turbolinux Home
• Turbolinux Turbolinux 10 F...
• Turbolinux Turbolinux Desktop 10.0.0
• Turbolinux Turbolinux Server 10.0.0
• Turbolinux Turbolinux Server 8.0.0
• Ubuntu Ubuntu Linux 4.1.0 ia32
• Ubuntu Ubuntu Linux 4.1.0 ia64
• Ubuntu Ubuntu Linux 4.1.0 ppc
• Ubuntu Ubuntu Linux 5.0.0 4 amd64
• Ubuntu Ubuntu Linux 5.0.0 4 i386
• Ubuntu Ubuntu Linux 5.0.0 4 powerpc
• WireX Immunix OS 7+

References:

• ALT Linux: [security-announce] I: updated packages available
• Apple: Security Update 2005-003
• Avaya: ASA-2005-088 - Vulnerabilities in krb5 - (RHSA-2005-330)
• Avaya: ASA-2005-132 - telnet
• Conectiva: CLSA-2005:962 - Fix for buffer overflows in telnet client
• F5 Software: Homepage
• Heimdal: 2005-04-20: telnet vulnerabilities
• MIT: MITKRB5-SA-2005-001-telnet
• NetBSD: NetBSD Homepage
• OpenBSD: 014: SECURITY FIX: March 30, 2005 -OpenBSD 3.6 buffer overflows in telnet(1)
• OpenBSD: 031: SECURITY FIX: March 30, 2005 - OpenBSD 3.5 buffer overflows in telnet(1)
• Openwall Project: Changes made between Owl 1.1 and Owl-current.
• RedHat: RHSA-2005:327-10 - telnet security update
• RedHat: RHSA-2005:330-06 - krb5 security update
• Sun: Buffer Overflow in telnet(1) Client Software Also Affects Kerberized Telnet
• Sun: Sun Alert ID: 57755 - Buffer Overflow in telnet(1) Client Software
• UNIRAS: 20051101-00969 - NetBSD 2.0.3

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