GnuTLS RSA key exponent 3 security bypass

gnutls-rsakey-security-bypass (28953) The risk level is classified as MediumMedium Risk

Description:

Gnu Transport Layer Security Library (GnuTLS) could allow a remote attacker to bypass security restrictions caused by an improper validation of certain signatures. If an RSA key with exponent 3 is used, a remote attacker could forge a PKCS #1 v1.5 signature and certificate signed by that key.

*CVSS:

Base Score: 2.8
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 2.1
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of GnuTLS Library (version 1.4.4 or later), available from the GnuTLS Library Web site. See References.

For Red Hat Linux 4:
Refer to RHSA-2006:0680-4 for patch, upgrade, or suggested workaround information. See References.

For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 200609-15 for patch, upgrade, or suggested workaround information. See References.

For Debian GNU/Linux:
Refer to DSA-1182-1 for patch, upgrade, or suggested workaround information. See References.

For SUSE Linux:
Refer to SUSE SUSE-SA:2007:010 Security Announcement for patch, upgrade, or suggested workaround information. See References.

For Sun Solaris:
Refer to Sun Alert ID: 102970 Security Announcement for patch, upgrade, or suggested workaround information. See References.

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

References:

  • GNU TLS Library Project Web site: The GNU Transport Layer Security Library.
  • Sun Alert ID: 102970: Security Vulnerability in RSA Signature Verification Affects GnuTLS Library Versions .
  • ASA-2006-225: gnutls security update (RHSA-2006-0680)
  • ASA-2007-282: Security Vulnerability in RSA Signature Verification Affects GnuTLS Library Versions Prior to 1.4.4 (Sun 102970)
  • BID-20027: GNUTLS PKCS RSA Signature Forgery Vulnerability
  • CVE-2006-4790: verify.c in GnuTLS before 1.4.4, when using an RSA key with exponent 3, does not properly handle excess data in the digestAlgorithm.parameters field when generating a hash, which allows remote attackers to forge a PKCS #1 v1.5 signature that is signed by that RSA key and prevents GnuTLS from correctly verifying X.509 and other certificates that use PKCS, a variant of CVE-2006-4339.
  • DSA-1182: gnutls11 -- cryptographic weakness
  • GLSA-200609-15: GnuTLS: RSA Signature Forgery
  • MDKSA-2006:166: gnutls
  • RHSA-2006-0680: gnutls security update
  • SA21937: GnuTLS RSA Signature Forgery Vulnerability
  • SA22226: Sun Solaris RSA Signature Forgery Vulnerability
  • SA22992: Avaya CMS Sun Solaris X Display Manager Security Issue
  • SA25762: Sun Solaris GnuTLS RSA Signature Forgery Vulnerability
  • SECTRACK ID: 1016844: GnuTLS May Allow Digital Signatures to Be Forged
  • SUSE-SA:2007:010: IBMJava security update
  • SUSE-SR:2006:023: SUSE Security Summary Report
  • USN-348-1: GnuTLS vulnerability
  • VUPEN/ADV-2006-3635: GnuTLS RSA Key Handling PKCS #1 v1.5 Security Bypass and Signature Forgery
  • VUPEN/ADV-2006-3899: Sun Solaris Multiple Applications OpenSSL RSA Signature Forgery Vulnerability
  • VUPEN/ADV-2007-2289: Sun Solaris Security Update Fixes GnuTLS RSA Key Signature Forgery Vulnerability

Platforms Affected:

  • Canonical Ubuntu 5.04
  • Canonical Ubuntu 5.10
  • Canonical Ubuntu 6.06 LTS
  • Debian Debian Linux 3.1
  • Gentoo Linux
  • GNU GnuTLS 1.0.17
  • GNU GnuTLS 1.0.18
  • GNU GnuTLS 1.0.19
  • GNU GnuTLS 1.0.20
  • GNU GnuTLS 1.0.21
  • GNU GnuTLS 1.0.22
  • GNU GnuTLS 1.0.23
  • GNU GnuTLS 1.0.24
  • GNU GnuTLS 1.0.25
  • GNU GnuTLS 1.1.14
  • GNU GnuTLS 1.1.15
  • GNU GnuTLS 1.1.16
  • GNU GnuTLS 1.1.17
  • GNU GnuTLS 1.1.18
  • GNU GnuTLS 1.1.19
  • GNU GnuTLS 1.1.20
  • GNU GnuTLS 1.1.21
  • GNU GnuTLS 1.1.22
  • GNU GnuTLS 1.1.23
  • GNU GnuTLS 1.2.0
  • GNU GnuTLS 1.2.1
  • GNU GnuTLS 1.2.10
  • GNU GnuTLS 1.2.11
  • GNU GnuTLS 1.2.2
  • GNU GnuTLS 1.2.3
  • GNU GnuTLS 1.2.4
  • GNU GnuTLS 1.2.5
  • GNU GnuTLS 1.2.6
  • GNU GnuTLS 1.2.7
  • GNU GnuTLS 1.2.8
  • GNU GnuTLS 1.2.8.1 a1
  • GNU GnuTLS 1.2.9
  • GNU GnuTLS 1.3.0
  • GNU GnuTLS 1.3.1
  • GNU GnuTLS 1.3.2
  • GNU GnuTLS 1.3.3
  • GNU GnuTLS 1.3.4
  • GNU GnuTLS 1.3.5
  • GNU GnuTLS 1.4.0
  • GNU GnuTLS 1.4.1
  • MandrakeSoft Mandrake Linux 2006
  • MandrakeSoft Mandrake Linux 2006 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
  • MandrakeSoft Mandrake Linux Corporate Server 4.0
  • Novell Linux POS 9
  • Novell Open Enterprise Server
  • Novell Open Enterprise Server
  • Novell SLE SDK 10
  • Novell UnitedLinux 1.0
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 ES
  • Sun Solaris 10 SPARC
  • Sun Solaris 10 x86
  • SuSE Linux Enterprise Server 8
  • SuSE SuSE Linux OpenExchange Server 4
  • SuSE SuSE Linux Retail Solution 8
  • SuSE SuSE Linux School Server
  • SuSE SuSE Linux Standard Server 8
  • SuSE SuSE SLES 10
  • SuSE SuSE SLES 9

Reported:

Sep 14, 2006

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