cURL / libcURL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

BID:36032

Info

cURL / libcURL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

Bugtraq ID: 36032
Class: Design Error
CVE: CVE-2009-2417
Remote: Yes
Local: No
Published: Aug 12 2009 12:00AM
Updated: Jun 27 2011 04:40PM
Credit: Scott Cantor
Vulnerable: VMWare vMA 4.0
VMWare ESX Server 4.0
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 Server 9
SuSE SUSE Linux Enterprise 11
SuSE SUSE Linux Enterprise 10
SuSE openSUSE 10.3
Slackware Linux 10.2
Slackware Linux 10.1
Slackware Linux 10.0
Slackware Linux 9.1
Slackware Linux 12.2
Slackware Linux 12.1
Slackware Linux 12.0
Slackware Linux 11.0
Slackware Linux -current
S.u.S.E. openSUSE 11.1
S.u.S.E. openSUSE 11.0
S.u.S.E. Open-Enterprise-Server 0
S.u.S.E. Novell Linux Desktop 9.0
rPath rPath Linux 2
rPath rPath Linux 1
rPath Appliance Platform Linux Service 2
rPath Appliance Platform Linux Service 1
RedHat Enterprise Linux WS 4
RedHat Enterprise Linux WS 3
RedHat Enterprise Linux ES 4
RedHat Enterprise Linux ES 3
RedHat Enterprise Linux Desktop Workstation 5 client
RedHat Enterprise Linux AS 4
RedHat Enterprise Linux AS 3
RedHat Enterprise Linux Desktop version 4
RedHat Enterprise Linux 5 server
RedHat Desktop 3.0
Red Hat Enterprise Linux Desktop 5 client
Pardus Linux 2009 0
Pardus Linux 2008 0
MandrakeSoft Multi Network Firewall 2.0
MandrakeSoft Linux Mandrake 2009.0 x86_64
MandrakeSoft Linux Mandrake 2009.0
MandrakeSoft Linux Mandrake 2008.1 x86_64
MandrakeSoft Linux Mandrake 2008.1
MandrakeSoft Linux Mandrake 2008.0 x86_64
MandrakeSoft Linux Mandrake 2008.0
MandrakeSoft Enterprise Server 5 x86_64
MandrakeSoft Enterprise Server 5
MandrakeSoft Corporate Server 4.0 x86_64
MandrakeSoft Corporate Server 3.0 x86_64
MandrakeSoft Corporate Server 3.0
MandrakeSoft Corporate Server 4.0
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
Daniel Stenberg curl 7.19.5
Daniel Stenberg curl 7.19.4
Daniel Stenberg curl 7.19.3
Daniel Stenberg curl 7.19
Daniel Stenberg curl 7.18.1
Daniel Stenberg curl 7.18
Daniel Stenberg curl 7.17
Daniel Stenberg curl 7.16.4
Daniel Stenberg curl 7.15.5
Daniel Stenberg curl 7.15.3
Daniel Stenberg curl 7.15.2
Daniel Stenberg curl 7.15.1
Daniel Stenberg curl 7.15
Daniel Stenberg curl 7.14.1
Daniel Stenberg curl 7.14
Daniel Stenberg curl 7.13.2
Daniel Stenberg curl 7.13.1
Daniel Stenberg curl 7.13
Daniel Stenberg curl 7.12.3
Daniel Stenberg curl 7.12.2
Daniel Stenberg curl 7.12.1
Daniel Stenberg curl 7.12
Daniel Stenberg curl 7.11.2
Daniel Stenberg curl 7.11.1
Daniel Stenberg curl 7.11
Daniel Stenberg curl 7.10.8
Daniel Stenberg curl 7.10.7
Daniel Stenberg curl 7.10.6
Daniel Stenberg curl 7.10.5
Daniel Stenberg curl 7.10.4
Daniel Stenberg curl 7.10.3
Daniel Stenberg curl 7.10.2
Daniel Stenberg curl 7.10.1
Daniel Stenberg curl 7.10
Daniel Stenberg curl 7.9.8
Daniel Stenberg curl 7.9.7
Daniel Stenberg curl 7.9.6
Daniel Stenberg curl 7.9.5
Daniel Stenberg curl 7.9.4
Daniel Stenberg curl 7.9.3
Daniel Stenberg curl 7.9.2
Daniel Stenberg curl 7.9.1
Daniel Stenberg curl 7.9
Daniel Stenberg curl 7.8.2
+ RedHat Advanced Workstation for the Itanium Processor 2.1
+ RedHat Enterprise Linux AS 2.1 IA64
+ RedHat Enterprise Linux AS 2.1
+ RedHat Enterprise Linux ES 2.1 IA64
+ RedHat Enterprise Linux ES 2.1
+ RedHat Enterprise Linux WS 2.1 IA64
+ RedHat Enterprise Linux WS 2.1
Daniel Stenberg curl 7.8.1
Daniel Stenberg curl 7.8
Daniel Stenberg curl 7.7.3
Daniel Stenberg curl 7.7.2
Daniel Stenberg curl 7.7.1
Daniel Stenberg curl 7.7
Daniel Stenberg curl 7.6.1
Daniel Stenberg curl 7.6
Daniel Stenberg curl 7.5.2
Daniel Stenberg curl 7.5.1
Daniel Stenberg curl 7.5
Daniel Stenberg curl 7.4.2
Daniel Stenberg curl 7.4.1
Daniel Stenberg curl 7.4
Daniel Stenberg curl 7.3
Daniel Stenberg curl 7.2.1
Daniel Stenberg curl 7.2
Daniel Stenberg curl 7.1.1
Daniel Stenberg curl 7.1
Daniel Stenberg curl 7.16.3
Apple Mac OS X Server 10.6.2
Apple Mac OS X Server 10.6.1
Apple Mac OS X Server 10.5.8
Apple Mac OS X Server 10.5.7
Apple Mac OS X Server 10.5.6
Apple Mac OS X Server 10.5.5
Apple Mac OS X Server 10.5.4
Apple Mac OS X Server 10.5.3
Apple Mac OS X Server 10.5.2
Apple Mac OS X Server 10.5.1
Apple Mac OS X Server 10.6
Apple Mac OS X Server 10.5
Apple Mac OS X 10.6.2
Apple Mac OS X 10.6.1
Apple Mac OS X 10.5.8
Apple Mac OS X 10.5.7
Apple Mac OS X 10.5.6
Apple Mac OS X 10.5.5
Apple Mac OS X 10.5.4
Apple Mac OS X 10.5.3
Apple Mac OS X 10.5.2
Apple Mac OS X 10.5.1
Apple Mac OS X 10.6
Apple Mac OS X 10.5
Not Vulnerable: VMWare vMA 4.0 Patch 2
Daniel Stenberg curl 7.19.6
Apple Mac OS X Server 10.6.3
Apple Mac OS X 10.6.3

Discussion

cURL / libcURL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

cURL and libcURL are prone to a security-bypass vulnerability because they fail to properly validate the domain name in a signed CA certificate, allowing attackers to substitute malicious SSL certificates for trusted ones.

This issue affects cURL and libcURL when compiled against OpenSSL.

Successful exploits allow attackers to perform man-in-the-middle attacks or impersonate trusted servers, which will aid in further attacks.

cURL and libcURL 7.4 through 7.19.5 are vulnerable. Additional applications that use the affected library may also be vulnerable.

Exploit / POC

cURL / libcURL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

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

Solution / Fix

cURL / libcURL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

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


Ubuntu Ubuntu Linux 8.10 powerpc

Slackware Linux 12.2

Debian Linux 5.0 alpha

MandrakeSoft Linux Mandrake 2008.0

Ubuntu Ubuntu Linux 9.04 sparc

Debian Linux 4.0 amd64

Debian Linux 4.0 ia-32

Ubuntu Ubuntu Linux 8.10 sparc

Ubuntu Ubuntu Linux 9.04 lpia

Debian Linux 5.0 armel

Apple Mac OS X 10.6

MandrakeSoft Linux Mandrake 2009.0 x86_64

Debian Linux 5.0 mips

VMWare ESX Server 4.0

Ubuntu Ubuntu Linux 9.04 amd64

Debian Linux 4.0 mips

Debian Linux 5.0 sparc

MandrakeSoft Linux Mandrake 2008.1 x86_64

Debian Linux 4.0 arm

MandrakeSoft Linux Mandrake 2008.1

Debian Linux 4.0 powerpc

Ubuntu Ubuntu Linux 8.10 i386

Debian Linux 4.0 m68k

MandrakeSoft Enterprise Server 5

Debian Linux 5.0 s/390

Ubuntu Ubuntu Linux 8.04 LTS lpia

Ubuntu Ubuntu Linux 6.06 LTS i386

Debian Linux 5.0 hppa

Debian Linux 4.0 sparc

MandrakeSoft Linux Mandrake 2009.0

Ubuntu Ubuntu Linux 8.04 LTS i386

Apple Mac OS X 10.5

Slackware Linux 10.0

Slackware Linux 10.2

Apple Mac OS X 10.5.2

Apple Mac OS X Server 10.5.2

Apple Mac OS X 10.5.3

Apple Mac OS X Server 10.5.3

Apple Mac OS X 10.5.4

Apple Mac OS X Server 10.5.5

Apple Mac OS X 10.5.6

Apple Mac OS X 10.5.7

Apple Mac OS X 10.5.8

Apple Mac OS X 10.6.1

MandrakeSoft Corporate Server 3.0

Daniel Stenberg curl 7.15.1

Daniel Stenberg curl 7.16.4

Slackware Linux 9.1

References

cURL / libcURL NULL Character CA SSL Certificate Validation Security Bypass Vulnerability

References:

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