OpenPGP Cipher Feedback Mode Chosen-Ciphertext Partial Plaintext Retrieval Vulnerability

BID:12529

Info

OpenPGP Cipher Feedback Mode Chosen-Ciphertext Partial Plaintext Retrieval Vulnerability

Bugtraq ID: 12529
Class: Design Error
CVE: CVE-2005-0366
Remote: Yes
Local: No
Published: Feb 11 2005 12:00AM
Updated: Jul 12 2009 10:06AM
Credit: Discovery is credited to Serge Mister and Robert Zuccherato of Entrust.
Vulnerable: Ubuntu Ubuntu Linux 5.0 4 powerpc
Ubuntu Ubuntu Linux 5.0 4 i386
Ubuntu Ubuntu Linux 5.0 4 amd64
Ubuntu Ubuntu Linux 4.1 ppc
Ubuntu Ubuntu Linux 4.1 ia64
Ubuntu Ubuntu Linux 4.1 ia32
S.u.S.E. Linux Personal 9.2 x86_64
S.u.S.E. Linux Personal 9.2
S.u.S.E. Linux Personal 9.1 x86_64
S.u.S.E. Linux Personal 9.1
S.u.S.E. Linux Personal 9.0 x86_64
S.u.S.E. Linux Personal 9.0
S.u.S.E. Linux Personal 8.2
OpenPGP OpenPGP
GNU GNU Privacy Guard 1.2.4
+ MandrakeSoft Corporate Server 3.0 x86_64
 + MandrakeSoft Corporate Server 3.0
+ Mandriva Linux Mandrake 10.1 x86_64
 + Mandriva Linux Mandrake 10.1
+ Mandriva Linux Mandrake 10.0 AMD64
 + Mandriva Linux Mandrake 10.0
GNU GNU Privacy Guard 1.2.3
+ Mandriva Linux Mandrake 9.2
+ Turbolinux Turbolinux Desktop 10.0
GNU GNU Privacy Guard 1.2.2 -rc1
+ S.u.S.E. Linux Personal 8.2
GNU GNU Privacy Guard 1.2.2 -r1
+ Gentoo Linux 1.4 _rc3
 + Gentoo Linux 1.4 _rc2
 + Gentoo Linux 1.4 _rc1
 GNU GNU Privacy Guard 1.2.2
+ Caldera OpenLinux Server 3.1.1
+ Caldera OpenLinux Workstation 3.1.1
+ Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1
GNU GNU Privacy Guard 1.2.1
+ OpenPKG OpenPKG 1.2
+ Redhat Linux 9.0 i386
 + Terra Soft Solutions Yellow Dog Linux 3.0
GNU GNU Privacy Guard 1.2
GNU GNU Privacy Guard 1.0.7
+ MandrakeSoft apcupsd 2006.0
 + MandrakeSoft Corporate Server 2.1 x86_64
 + MandrakeSoft Corporate Server 2.1
+ MandrakeSoft Multi Network Firewall 2.0
+ Mandriva Linux Mandrake 9.0
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
+ OpenPKG OpenPKG 1.1
+ 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
 + Redhat Linux 8.0 i386
 + Redhat Linux 7.3 i386
 + Redhat Linux 7.2 ia64
 + Redhat Linux 7.2 i386
 + Redhat Linux 7.1 i386
 + Redhat Linux Advanced Work Station 2.1
+ Sun Linux 5.0.5
+ Turbolinux Turbolinux Server 8.0
+ Turbolinux Turbolinux Server 7.0
+ Turbolinux Turbolinux Server 6.5
+ Turbolinux Turbolinux Server 6.1
+ Turbolinux Turbolinux Workstation 8.0
+ Turbolinux Turbolinux Workstation 7.0
+ Turbolinux Turbolinux Workstation 6.0
GNU GNU Privacy Guard 1.0.6
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 + Debian Linux 3.0
GNU GNU Privacy Guard 1.0.5
- Caldera OpenLinux 2.4
- Caldera OpenLinux 2.3
- Caldera OpenLinux eBuilder 3.0
- Debian Linux 2.2 sparc
 - Debian Linux 2.2 powerpc
 - Debian Linux 2.2 arm
 - Debian Linux 2.2 alpha
 - Debian Linux 2.2 68k
 - Debian Linux 2.2
- Immunix Immunix OS 7.0 beta
 - Immunix Immunix OS 7.0
- Immunix Immunix OS 6.2
- MandrakeSoft Corporate Server 1.0.1
- Mandriva Linux Mandrake 8.1
- Mandriva Linux Mandrake 8.0 ppc
 - Mandriva Linux Mandrake 8.0
- Mandriva Linux Mandrake 7.2
- Mandriva Linux Mandrake 7.1
- Microsoft Windows 95
- Microsoft Windows 98
- Microsoft Windows ME
- Redhat Linux 7.1 i386
 - Redhat Linux 7.1
- Redhat Linux 7.0 i386
 - Redhat Linux 7.0 alpha
 - Redhat Linux 7.0
- Redhat Linux 6.2 sparc
 - Redhat Linux 6.2 i386
 - Redhat Linux 6.2 alpha
 - Redhat Linux 6.2
 - SuSE Linux 7.1
- SuSE Linux 7.0
- SuSE Linux 6.4
- SuSE Linux 6.3
- Trustix Secure Linux 1.2
- Trustix Secure Linux 1.1
GNU GNU Privacy Guard 1.0.4
- Turbolinux Turbolinux 6.0.5
- Turbolinux Turbolinux Server 6.5
- Turbolinux Turbolinux Workstation 6.1
GNU GNU Privacy Guard 1.0.3 b
GNU GNU Privacy Guard 1.0.3
GNU GNU Privacy Guard 1.0.2
GNU GNU Privacy Guard 1.0.1
GNU GNU Privacy Guard 1.0 .6
- MandrakeSoft Corporate Server 1.0.1
- Mandriva Linux Mandrake 8.1
- Mandriva Linux Mandrake 8.0 ppc
 - Mandriva Linux Mandrake 8.0
- Mandriva Linux Mandrake 7.2
- Mandriva Linux Mandrake 7.1
GNU GNU Privacy Guard 1.0
Gentoo Linux
ALT Linux ALT Linux Junior 2.3
ALT Linux ALT Linux Compact 2.3
Not Vulnerable:

Discussion

OpenPGP Cipher Feedback Mode Chosen-Ciphertext Partial Plaintext Retrieval Vulnerability

OpenPGP is reported prone to a vulnerability that may theoretically allow attackers to retrieve partial plaintexts from encrypted OpenPGP messages.

It is reported that a proof of concept chosen-ciphertext attack method has been developed that exploits a flaw in OpenPGP to retrieve partial plaintexts from OpenPGP messages encrypted with symmetric encryption. Apparently when messages are encrypted with the CFB mode, a design flaw in an integrity check feature can be exploited.

The attack is also limited in the amount of information that can be disclosed from an encrypted message. Apparently, only partial disclosure of a message is possible.

The OpenPGP standard is reported vulnerable to this issue. It is not known whether PGP or GNU Privacy Guard or other implementations are vulnerable. This BID will be updated when more information becomes available.

Exploit / POC

OpenPGP Cipher Feedback Mode Chosen-Ciphertext Partial Plaintext Retrieval Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

OpenPGP Cipher Feedback Mode Chosen-Ciphertext Partial Plaintext Retrieval Vulnerability

Solution:
ALT Linux has released updates dealing with this and other issues. Please see the reference section for more information.

SUSE has released advisory SUSE-SR:2005:007 to address this issue. Please see the referenced advisory for more information.

Mandrake Linux has released advisory MDKSA-2005:057 along with fixes dealing with this issue. Please see the referenced advisory for more information.

Gentoo has released advisory GLSA 200503-29 to address this issue. Please see the referenced advisory for more information. Gentoo users may carry out the following commands to update their computers:

emerge --sync
emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.1"

Ubuntu Linux has released security advisory USN-170-1 addressing this issue. Please see the referenced advisory for further information.


GNU GNU Privacy Guard 1.0.7

GNU GNU Privacy Guard 1.2.3

GNU GNU Privacy Guard 1.2.4

S.u.S.E. Linux Personal 8.2

S.u.S.E. Linux Personal 9.0

S.u.S.E. Linux Personal 9.0 x86_64

S.u.S.E. Linux Personal 9.1 x86_64

S.u.S.E. Linux Personal 9.1

S.u.S.E. Linux Personal 9.2

S.u.S.E. Linux Personal 9.2 x86_64

References

OpenPGP Cipher Feedback Mode Chosen-Ciphertext Partial Plaintext Retrieval Vulnerability

References:
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