GnuPG gpgv improper signature verification
| gnupg-gpgv-improper-verification (24744) |  Low Risk |
Description:
GNU Privacy Guard (GnuPG or GPG) could allow certain detached signature files to bypass signature verification. If GnuPG is being used for unattended signature verification, the gpgv tool or gpg --verify command will show that signature verification for detached files has succeeded even if the detached file does not contain a valid signature. This would result in a loss of data integrity for digitally signed files.
Platforms Affected:
- Canonical, Ubuntu 4.10
- Canonical, Ubuntu 5.04
- Canonical, Ubuntu 5.10
- Debian, Debian Linux 3.0
- Debian, Debian Linux 3.1
- Gentoo, Linux
- GNU, Privacy Guard 1.0
- GNU, Privacy Guard 1.0.1
- GNU, Privacy Guard 1.0.2
- GNU, Privacy Guard 1.0.3
- GNU, Privacy Guard 1.0.4
- GNU, Privacy Guard 1.0.5
- GNU, Privacy Guard 1.0.6
- GNU, Privacy Guard 1.0.7
- GNU, Privacy Guard 1.2
- GNU, Privacy Guard 1.2.1
- GNU, Privacy Guard 1.2.2
- GNU, Privacy Guard 1.2.3
- GNU, Privacy Guard 1.2.4
- GNU, Privacy Guard 1.2.5
- GNU, Privacy Guard 1.2.6
- GNU, Privacy Guard 1.2.7
- GNU, Privacy Guard 1.3.3
- GNU, Privacy Guard 1.3.4
- GNU, Privacy Guard 1.4
- GNU, Privacy Guard 1.4.1
- GNU, Privacy Guard 1.4.2
- MandrakeSoft, Mandrake Linux 10.1
- MandrakeSoft, Mandrake Linux 10.1 X86_64
- MandrakeSoft, Mandrake Linux 2006
- MandrakeSoft, Mandrake Linux 2006 X86_64
- MandrakeSoft, Mandrake Linux LE2005
- MandrakeSoft, Mandrake Linux LE2005 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 2.1 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 2.1
- MandrakeSoft, Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 3.0
- MandrakeSoft, Mandrake Multi Network Firewall 2.0
- Novell, Linux Desktop 9
- Novell, Open Enterprise Server
- Novell, Open Enterprise Server 1
- Novell, Open Enterprise Server
- Novell, UnitedLinux 1.0
- OpenPKG, OpenPKG 2.3
- OpenPKG, OpenPKG 2.4
- OpenPKG, OpenPKG 2.5
- OpenPKG, OpenPKG CURRENT
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 2.1 WS
- RedHat, Enterprise Linux 2.1 ES
- RedHat, Enterprise Linux 3 WS
- RedHat, Enterprise Linux 3 ES
- RedHat, Enterprise Linux 3 AS
- RedHat, Enterprise Linux 3 Desktop
- RedHat, Enterprise Linux 4 WS
- RedHat, Enterprise Linux 4 ES
- RedHat, Enterprise Linux 4 Desktop
- RedHat, Enterprise Linux 4 AS
- RedHat, Linux Advanced Workstation 2.1 Itanium
- SGI, Advanced Linux Environment 3
- SuSE, SuSE Linux 10.0
- SuSE, SuSE Linux 9.1
- SuSE, SuSE Linux 9.2
- SuSE, SuSE Linux 9.3
- SuSE, SuSE Linux Desktop 1.0
- SuSE, SuSE Linux Enterprise Server 8.0
- SuSE, SuSE Linux Enterprise Server 9.0
- SuSE, SuSE SLES 9
Remedy:
Upgrade to the latest version of GnuPG (1.4.2.1 or later), available from GnuPG.org. See References.
For Debian Linux:
Refer to DSA-978-1 for upgrade information. See References.
For Ubuntu Linux:
Refer to USN-252-1 for upgrade information. See References.
For SUSE Linux:
Refer to SUSE Security Announcement: SUSE-SA:2006:009 for patch, upgrade, or suggested workaround information. See References.
For SUSE Linux:
Refer to SUSE Security Announcement SUSE-SA:2006:013 for patch, upgrade, or suggested workaround information. See References.
For Red Hat Linux:
Refer to RHSA-2006:0266-8 or RHSA-2006:0265-9 for patch, upgrade, or suggested workaround information. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 2006-02-10 for patch, upgrade, or suggested workaround information. See References.
For OpenPKG:
Refer to OpenPKG Security Advisory OpenPKG-SA-2006.001 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for patch or upgrade information.
Consequences:
Other
References:
- gnupg-announce Mailing List, Wed Feb 15 08:49:25 CET 2006, False positive signature verification in GnuPG at http://lists.gnupg.org/pipermail/gnupg-announce/2006q1/000211.html.
- SGI Security Advisory 20060401-01-U, SGI Advanced Linux Environment 3 Security Update #56 at ftp://patches.sgi.com/support/free/security/advisories/20060401-01.U.asc.
- ASA-2006-070: gnupg security update (RHSA-2006-0266)
- BID-16663: GnuPG Detached Signature Verification Bypass Vulnerability
- CVE-2006-0455: gpgv in GnuPG before 1.4.2.1, when using unattended signature verification, returns a 0 exit code in certain cases even when the detached signature file does not carry a signature, which could cause programs that use gpgv to assume that the signature verification has succeeded. Note: this also occurs when running the equivalent command gpg --verify.
- DSA-978: gnupg -- programming error
- FrSIRT/ADV-2006-0610: GnuPG gpgv Signature Verification Security Bypass Vulnerability
- GLSA-200602-08: libtasn1, GNU TLS: Security flaw in DER decoding
- GLSA-200602-10: GnuPG: Incorrect signature verification
- MDKSA-2006:043: Updated gnupg packages fix signature file verification vulnerability
- OpenPKG-SA-2006.001: GnuPG
- RHSA-2006-0266: gnupg security update
- SA18845: GnuPG "gpgv" Signature Verification Security Issue
- SUSE-SA:2006:009: gpg/liby2util incorrect gpg signature checking
- SUSE-SA:2006:013: gpg / liby2util signature checking problems
- SUSE-SA:2006:014: gpg signature checking problems
- SUSE-SR:2006:005: SUSE Security Summary Report
- USN-252-1: gnupg vulnerability
Reported:
Feb 15, 2006
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