Date: Wed, 07 Jan 2009 22:49:07 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: freebsd-security@freebsd.org Subject: Re: FreeBSD Security Advisory FreeBSD-SA-09:02.openssl Message-ID: <49653163.4070904@infracaninophile.co.uk> In-Reply-To: <200901072137.n07LbHwD049781@freefall.freebsd.org> References: <200901072137.n07LbHwD049781@freefall.freebsd.org>
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[-- Attachment #1 --] FreeBSD Security Advisories wrote: > I. Background > > FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is > a collaborative effort to develop a robust, commercial-grade, full-featured > Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) > and Transport Layer Security (TLS v1) protocols as well as a full-strength > general purpose cryptography library. > > II. Problem Description > > The EVP_VerifyFinal() function from OpenSSL is used to determine if a > digital signature is valid. The SSL layer in OpenSSL uses > EVP_VerifyFinal(), which in several places checks the return value > incorrectly and treats verification errors as a good signature. This > is only a problem for DSA and ECDSA keys. > > III. Impact > > For applications using OpenSSL for SSL connections, an invalid SSL > certificate may be interpreted as valid. This could for example be > used by an attacker to perform a man-in-the-middle attack. > > Other applications which use the OpenSSL EVP API may similarly be > affected. The oCert advisory at http://ocert.org/advisories/ocert-2008-016.html lists BIND and NTP as affected packages. Don't the base system versions of those apps also need patching? Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAkllMWkACgkQ8Mjk52CukIzwxACfU95u+9VBD5XQRuzWWnvEl40X kbsAoIA3OqnlhuzB3dINZF+T2rcPK9Xc =haIW -----END PGP SIGNATURE-----
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