GLSA 200609-15: GnuTLS: RSA Signature Forgery
| Severity: | normal |
| Title: | GnuTLS: RSA Signature Forgery |
| Date: | 09/26/2006 |
| Bugs: | |
| ID: | 200609-15 |
Synopsis
GnuTLS fails to handle excess data which could allow an attacker to forge a PKCS #1 v1.5 signature.Background
GnuTLS is an implementation of SSL 3.0 and TLS 1.0.
Affected packages
| Package | Vulnerable | Unaffected | Architecture(s) |
|---|---|---|---|
| net-libs/gnutls | < 1.4.4 | >= 1.4.4 | All supported architectures |
Description
verify.c fails to properly handle excess data in digestAlgorithm.parameters field while generating a hash when using an RSA key with exponent 3. RSA keys that use exponent 3 are commonplace.
Impact
Remote attackers could forge PKCS #1 v1.5 signatures that are signed with an RSA key, preventing GnuTLS from correctly verifying X.509 and other certificates that use PKCS.
Workaround
There is no known workaround at this time.
Resolution
All GnuTLS users should update both packages:
# emerge --sync
# emerge --update --ask --verbose ">=net-libs/gnutls-1.4.4"
References
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
Concerns?
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.
License
Copyright 2010 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.