GnuTLS NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

BID:35952

Info

GnuTLS NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

Bugtraq ID: 35952
Class: Design Error
CVE: CVE-2009-2730
Remote: Yes
Local: No
Published: Aug 04 2009 12:00AM
Updated: Apr 13 2015 09:13PM
Credit: Tomas Hoger
Vulnerable: Ubuntu Ubuntu Linux 9.04 sparc
Ubuntu Ubuntu Linux 9.04 powerpc
Ubuntu Ubuntu Linux 9.04 lpia
Ubuntu Ubuntu Linux 9.04 i386
Ubuntu Ubuntu Linux 9.04 amd64
Ubuntu Ubuntu Linux 8.10 sparc
Ubuntu Ubuntu Linux 8.10 powerpc
Ubuntu Ubuntu Linux 8.10 lpia
Ubuntu Ubuntu Linux 8.10 i386
Ubuntu Ubuntu Linux 8.10 amd64
Ubuntu Ubuntu Linux 8.04 LTS sparc
Ubuntu Ubuntu Linux 8.04 LTS powerpc
Ubuntu Ubuntu Linux 8.04 LTS lpia
Ubuntu Ubuntu Linux 8.04 LTS i386
Ubuntu Ubuntu Linux 8.04 LTS amd64
Ubuntu Ubuntu Linux 6.06 LTS sparc
Ubuntu Ubuntu Linux 6.06 LTS powerpc
Ubuntu Ubuntu Linux 6.06 LTS i386
Ubuntu Ubuntu Linux 6.06 LTS amd64
SuSE SUSE Linux Enterprise 11
SuSE SUSE Linux Enterprise 10
Slackware Linux x86_64 -current
Slackware Linux 13.0 x86_64
Slackware Linux 13.0
Slackware Linux 12.2
Slackware Linux 12.1
Slackware Linux -current
S.u.S.E. openSUSE 11.2
S.u.S.E. openSUSE 11.1
S.u.S.E. openSUSE 11.0
S.u.S.E. openSUSE 10.3
Redhat Enterprise Linux WS 4
Redhat Enterprise Linux ES 4
Redhat Enterprise Linux Desktop Workstation 5 client
Redhat Enterprise Linux Desktop 5 client
Redhat Enterprise Linux AS 4
Redhat Enterprise Linux Desktop version 4
Redhat Enterprise Linux 5 Server
Pardus Linux 2009 0
Mandriva Linux Mandrake 2009.1 x86_64
Mandriva Linux Mandrake 2009.1
Mandriva Linux Mandrake 2009.0 x86_64
Mandriva Linux Mandrake 2009.0
Mandriva Linux Mandrake 2008.1 x86_64
Mandriva Linux Mandrake 2008.1
Mandriva Linux Mandrake 2008.0 x86_64
Mandriva Linux Mandrake 2008.0
MandrakeSoft Enterprise Server 5 x86_64
MandrakeSoft Enterprise Server 5
MandrakeSoft Corporate Server 4.0 x86_64
MandrakeSoft Corporate Server 4.0
GNU GnuTLS 2.8.1
GNU GnuTLS 2.6.6
GNU GnuTLS 2.6.5
GNU GnuTLS 2.6.4
GNU GnuTLS 2.6.3
GNU GnuTLS 2.6.2
GNU GnuTLS 2.6.1
GNU GnuTLS 2.6
GNU GnuTLS 2.4.1
GNU GnuTLS 2.4
GNU GnuTLS 2.2.5
GNU GnuTLS 2.2.4
GNU GnuTLS 2.2.3
GNU GnuTLS 2.2.2
GNU GnuTLS 2.2.1
GNU GnuTLS 2.2
GNU GnuTLS 2.0
Gentoo Linux
Debian Linux 5.0 sparc
Debian Linux 5.0 s/390
Debian Linux 5.0 powerpc
Debian Linux 5.0 mipsel
Debian Linux 5.0 mips
Debian Linux 5.0 m68k
Debian Linux 5.0 ia-64
Debian Linux 5.0 ia-32
Debian Linux 5.0 hppa
Debian Linux 5.0 armel
Debian Linux 5.0 arm
Debian Linux 5.0 amd64
Debian Linux 5.0 alpha
Debian Linux 5.0
Debian Linux 4.0 sparc
Debian Linux 4.0 s/390
Debian Linux 4.0 powerpc
Debian Linux 4.0 mipsel
Debian Linux 4.0 mips
Debian Linux 4.0 m68k
Debian Linux 4.0 ia-64
Debian Linux 4.0 ia-32
Debian Linux 4.0 hppa
Debian Linux 4.0 armel
Debian Linux 4.0 arm
Debian Linux 4.0 amd64
Debian Linux 4.0 alpha
Debian Linux 4.0
Avaya Proactive Contact 4.1
Avaya Messaging Storage Server MM3.0
Avaya Messaging Storage Server 5.0
Avaya Messaging Storage Server 4.0
Avaya Messaging Storage Server 3.1
Avaya Message Networking MN 3.1
Avaya Meeting Exchange 5.2
Avaya Meeting Exchange 5.1 SP1
Avaya Meeting Exchange 5.1
Avaya Meeting Exchange 5.0 SP2
Avaya Meeting Exchange 5.0 SP1
Avaya Meeting Exchange 5.0
Avaya Intuity AUDIX LX 2.0 SP2
Avaya Intuity AUDIX LX 2.0 SP1
Avaya Intuity AUDIX LX 2.0
Avaya Communication Manager 3.1
+ Avaya Communication Manager Server DEFINITY Server SI/CS
+ Avaya Communication Manager Server S8100
+ Avaya Communication Manager Server S8300
+ Avaya Communication Manager Server S8500
+ Avaya Communication Manager Server S8700
Avaya Aura SIP Enablement Services 3.1.1
Avaya Aura SIP Enablement Services 5.2
Avaya Aura SIP Enablement Services 5.1
Avaya Aura SIP Enablement Services 5.0
Avaya Aura SIP Enablement Services 3.1
Not Vulnerable: GNU GnuTLS 2.8.2

Discussion

GnuTLS NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

GnuTLS is prone to a security-bypass vulnerability because it fails to properly validate the domain name in a signed CA certificate, allowing attackers to substitute malicious SSL certificates for trusted ones.

Successfully exploiting this issue allows attackers to perform man-in-the-middle attacks or impersonate trusted servers, which will aid in further attacks.

Versions prior to GnuTLS 2.8.2 are vulnerable.

Exploit / POC

GnuTLS NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

Attackers use man-in-the-middle attacks to exploit this issue.

Solution / Fix

GnuTLS NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

Solution:
Updates are available. Please see the references for more information.


Debian Linux 5.0 ia-64

Slackware Linux -current

Ubuntu Ubuntu Linux 8.04 LTS powerpc

Ubuntu Ubuntu Linux 8.10 powerpc

Ubuntu Ubuntu Linux 8.04 LTS sparc

Slackware Linux 12.2

Ubuntu Ubuntu Linux 6.06 LTS sparc

Debian Linux 5.0 alpha

Mandriva Linux Mandrake 2008.0 x86_64

Ubuntu Ubuntu Linux 8.04 LTS amd64

Mandriva Linux Mandrake 2008.0

Debian Linux 5.0 mipsel

Ubuntu Ubuntu Linux 9.04 sparc

Ubuntu Ubuntu Linux 9.04 powerpc

Debian Linux 4.0 amd64

Slackware Linux 12.1

Debian Linux 4.0 ia-32

Debian Linux 4.0 hppa

Ubuntu Ubuntu Linux 9.04 i386

Ubuntu Ubuntu Linux 8.10 sparc

Ubuntu Ubuntu Linux 9.04 lpia

Debian Linux 4.0 armel

Debian Linux 5.0 armel

Debian Linux 5.0

Debian Linux 4.0 mipsel

Mandriva Linux Mandrake 2009.0 x86_64

Debian Linux 5.0 mips

Ubuntu Ubuntu Linux 9.04 amd64

Mandriva Linux Mandrake 2009.1

Ubuntu Ubuntu Linux 8.10 amd64

Debian Linux 4.0 ia-64

Debian Linux 4.0 mips

Debian Linux 5.0 sparc

Slackware Linux x86_64 -current

Mandriva Linux Mandrake 2008.1 x86_64

Debian Linux 4.0 arm

Mandriva Linux Mandrake 2008.1

Mandriva Linux Mandrake 2009.1 x86_64

Debian Linux 4.0 powerpc

Ubuntu Ubuntu Linux 8.10 i386

MandrakeSoft Enterprise Server 5 x86_64

Debian Linux 4.0 m68k

Debian Linux 5.0 ia-32

Ubuntu Ubuntu Linux 6.06 LTS powerpc

MandrakeSoft Enterprise Server 5

Debian Linux 5.0 s/390

Ubuntu Ubuntu Linux 8.04 LTS lpia

GNU GnuTLS 2.0

GNU GnuTLS 2.2

GNU GnuTLS 2.2.2

GNU GnuTLS 2.2.3

GNU GnuTLS 2.2.5

GNU GnuTLS 2.4

GNU GnuTLS 2.4.1

GNU GnuTLS 2.6

GNU GnuTLS 2.6.2

GNU GnuTLS 2.6.4

GNU GnuTLS 2.6.5

GNU GnuTLS 2.6.6

References

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