FreeBSD Security Advisories
2001-Jul-10 07:37 UTC
FreeBSD Ports Security Advisory FreeBSD-SA-01:44.gnupg
-----BEGIN PGP SIGNED MESSAGE----- ============================================================================FreeBSD-SA-01:44 Security Advisory FreeBSD, Inc. Topic: gnupg contains format string vulnerability Category: ports Module: gnupg Announced: 2001-07-10 Credits: fish stiqz <fish@analog.org> Affects: Ports collection prior to the correction date. Corrected: 2001-05-30 Vendor status: Updated version released FreeBSD only: NO I. Background GnuPG is an implementation of the PGP digital signature/encryption protocol II. Problem Description The gnupg port, versions prior to gnupg-1.0.6, contains a format string vulnerability. If gnupg attempts to decrypt a file whose filename does not end in '.gpg', the filename is copied to the prompt string, allowing a user-supplied format string. This may allow a malicious user to cause arbitrary code to be executed as the user running gnupg. The gnupg port is not installed by default, nor is it "part of FreeBSD" as such: it is part of the FreeBSD ports collection, which contains over 5400 third-party applications in a ready-to-install format. The ports collection shipped with FreeBSD 4.3 is vulnerable to this problem since it was discovered after its release. FreeBSD makes no claim about the security of these third-party applications, although an effort is underway to provide a security audit of the most security-critical ports. III. Impact A malicious user supplying a file to be decrypted by the target user running gnupg may be able to craft a filename causing arbitrary code to be executed as the user running gnupg. If you have not chosen to install the gnupg port/package, then your system is not vulnerable to this problem. IV. Workaround Deinstall the gnupg port/package if you have installed it. V. Solution One of the following: 1) Upgrade your entire ports collection and rebuild the gnupg port. 2) Deinstall the old package and install a new package dated after the correction date, obtained from the following directories: [i386] ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/security/gnupg-1.0.6_1.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/security/gnupg-1.0.6_1.tgz [alpha] Packages are not automatically generated for the alpha architecture at this time due to lack of build resources. 3) download a new port skeleton for the gnupg port from: http://www.freebsd.org/ports/ and use it to rebuild the port. 4) Use the portcheckout utility to automate option (3) above. The portcheckout port is available in /usr/ports/devel/portcheckout or the package can be obtained from: ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: FreeBSD: The Power To Serve iQCVAwUBO0sNuVUuHi5z0oilAQEnPAP/XadCoa6avlv67LottE8OKLdxSbMRgVXL haBWIyZTMSLRiwgfiQS1riDXslCT8rI8piXSv5HI1zjT7OgkV6zXXRP2pez/EdLe H9sHUJMZNYP1VRfUUlxkmwfelT9cgD2Di3y9vrDouZTt4B5wEGgrzeNeQq1eFNlc 7SvBBZsxEZQ=g1DW -----END PGP SIGNATURE----- This is the moderated mailing list freebsd-announce. The list contains announcements of new FreeBSD capabilities, important events and project milestones. See also the FreeBSD Web pages at http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-announce" in the body of the message