Date: Thu, 20 Jul 2023 09:24:21 -0400 From: Demi Marie Obenour <demi@...isiblethingslab.com> To: oss-security@...ts.openwall.com Subject: Re: Announce: OpenSSH 9.3p2 released On Wed, Jul 19, 2023 at 08:40:40AM -0600, Damien Miller wrote: > OpenSSH 9.3p2 has just been released. It will be available from the > mirrors listed at https://www.openssh.com/ shortly. > > OpenSSH is a 100% complete SSH protocol 2.0 implementation and > includes sftp client and server support. > > Once again, we would like to thank the OpenSSH community for their > continued support of the project, especially those who contributed > code or patches, reported bugs, tested snapshots or donated to the > project. More information on donations may be found at: > https://www.openssh.com/donations.html > > Changes since OpenSSH 9.3 > ========================= > > This release fixes a security bug. > > Security > ======== > > Fix CVE-2023-38408 - a condition where specific libaries loaded via > ssh-agent(1)'s PKCS#11 support could be abused to achieve remote > code execution via a forwarded agent socket if the following > conditions are met: > > * Exploitation requires the presence of specific libraries on > the victim system. > * Remote exploitation requires that the agent was forwarded > to an attacker-controlled system. > > Exploitation can also be prevented by starting ssh-agent(1) with an > empty PKCS#11/FIDO allowlist (ssh-agent -P '') or by configuring > an allowlist that contains only specific provider libraries. > > This vulnerability was discovered and demonstrated to be exploitable > by the Qualys Security Advisory team. > > In addition to removing the main precondition for exploitation, > this release removes the ability for remote ssh-agent(1) clients > to load PKCS#11 modules by default (see below). > > Potentially-incompatible changes > -------------------------------- > > * ssh-agent(8): the agent will now refuse requests to load PKCS#11 > modules issued by remote clients by default. A flag has been added > to restore the previous behaviour "-Oallow-remote-pkcs11". > > Note that ssh-agent(8) depends on the SSH client to identify > requests that are remote. The OpenSSH >=8.9 ssh(1) client does > this, but forwarding access to an agent socket using other tools > may circumvent this restriction. > > Checksums: > ========== > > - SHA1 (openssh-9.3p2.tar.gz) = 219cf700c317f400bb20b001c0406056f7188ea4 > - SHA256 (openssh-9.3p2.tar.gz) = IA6+FH9ss/EB/QzfngJEKvfdyimN/9n0VoeOfMrGdug= > > Please note that the SHA256 signatures are base64 encoded and not > hexadecimal (which is the default for most checksum tools). The PGP > key used to sign the releases is available from the mirror sites: > https://cdn.openbsd.org/pub/OpenBSD/OpenSSH/RELEASE_KEY.asc > > Reporting Bugs: > =============== > > - Please read https://www.openssh.com/report.html > Security bugs should be reported directly to openssh@...nssh.com Should there be a system-wide configuration file containing a list of known-good PKCS#11 libraries? ssh-agent having to guess if something is a PKCS#11 library is less than awesome. -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
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