GnuPG improper non-detached signature verification

gnupg-nondetached-sig-verification (25184)

Low Risk

Description:

GNU Privacy Guard (GnuPG or GPG) could allow certain non-detached signature files to bypass signature verification. This could allow a remote attacker to inject arbitrary data into digitally signed files or messages, resulting in the 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
• GNU, Privacy Guard 1.4.2.1
• MandrakeSoft, Mandrake Linux 2006 X86_64
• MandrakeSoft, Mandrake Linux 2006
• MandrakeSoft, Mandrake Linux LE2005
• MandrakeSoft, Mandrake Linux LE2005 X86_64
• MandrakeSoft, Mandrake Linux Corporate Server 3.0
• MandrakeSoft, Mandrake Linux Corporate Server 3.0 X86_64
• MandrakeSoft, Mandrake Multi Network Firewall 2.0
• Novell, UnitedLinux 1.0
• RedHat, Enterprise Linux 2.1 AS
• RedHat, Enterprise Linux 2.1 WS
• RedHat, Enterprise Linux 2.1 ES
• RedHat, Enterprise Linux 3 AS
• RedHat, Enterprise Linux 3 WS
• RedHat, Enterprise Linux 3 Desktop
• RedHat, Enterprise Linux 3 ES
• RedHat, Enterprise Linux 4 Desktop
• RedHat, Enterprise Linux 4 WS
• RedHat, Enterprise Linux 4 ES
• 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 SLES 9

Remedy:

Upgrade to the latest version of GnuPG (1.4.2.2 or later), available from GnuPG.org. See References.

For Debian GNU/Linux:
Refer to DSA-993-2 for patch, upgrade, or suggested workaround information. See References.

For SGI Advanced Linux Environment:
Refer to SGI Security Advisory 20060401-01-U 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 2006-03-08 for patch, upgrade, or suggested workaround information. See References.

For Ubuntu Linux:
Refer to USN-264-1 for patch, upgrade, or suggested workaround information. See References.

For SUSE Linux:
Refer to SUSE Security Announcement SUSE-SA:2006:014 for patch, upgrade, or suggested workaround information. See References.

For other distributions:
Contact your vendor for patch or upgrade information.

Consequences:

Other

References:

• BugTraq Mailing List, Thu Mar 09 2006 - 12:53:40 CST , GnuPG does not detect injection of unsigned data at http://archives.neohapsis.com/archives/bugtraq/2006-02/0755.html.
• GnuPG.org, Download at http://www.gnupg.org/download/.
• 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-17058: GnuPG Incorrect Non-Detached Signature Verification Vulnerability
• CVE-2006-0049: gpg in GnuPG before 1.4.2.2 does not properly verify non-detached signatures, which allows attackers to inject unsigned data via a data packet that is not associated with a control packet, which causes the check for concatenated signatures to report that the signature is valid, a different vulnerability than CVE-2006-0455.
• DSA-993: gnupg -- programming error
• GLSA-200603-08: GnuPG: Incorrect signature verification
• MDKSA-2006:055: Updated gnupg packages fix signature file verification vulnerability
• OSVDB ID: 23790: GnuPG gpg Unsigned Data Injection Detection Failure
• RHSA-2006-0266: gnupg security update
• SA19173: GnuPG Unsigned Data Injection Detection Vulnerability
• SECTRACK ID: 1015749: GnuPG May Fail to Detect the Injection of Unsigned Data
• SUSE-SA:2006:014: gpg signature checking problems
• USN-264-1: gnupg vulnerability
• VUPEN/ADV-2006-0915: GnuPG Unsigned Data Injection and Signature Verification Bypass Vulnerability

Reported:

Mar 09, 2006

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