OpenBSD Journal

OpenBSD Journal

Intel® FPU Speculation Vulnerability Confirmed

Contributed by rueda on from the speculation-no-more dept.

Earlier this month, Philip Guenther (guenther@) committed (to amd64 -current) a change from lazy to semi-eager FPU switching to mitigate against rumored FPU state leakage in Intel® CPUs.

Theo de Raadt (deraadt@) discussed this in his BSDCan 2018 session.

Using information disclosed in Theo's talk, Colin Percival developed a proof-of-concept exploit in around 5 hours. This seems to have prompted an early end to an embargo (in which OpenBSD was not involved), and the official announcement of the vulnerability.

OpenBSD at BSDCan 2018

Contributed by rueda on from the all-present-and-correct dept.

BSDCan 2018 has concluded, and materials for (some of) the OpenBSD-related tutorials and talks can be found in the usual place.

Highlights include the unveiling of unveil(), hinted at by Bob Beck (beck@) in his p2k18 report, and "Speculating about Intel", by Theo de Raadt (deraadt@). [An unofficial video of the latter presentation is available.]

At the time of writing, official video recordings are not yet available.

libcsi - Crypto Simplified Interface

Contributed by rueda on from the continuing-sane-innovation dept.

Joel Sing (jsing@) has committed Crypto Simplified Interface (CSI) to -current:

CVSROOT:	/cvs
Module name:	src
Changes by:	jsing@cvs.openbsd.org	2018/06/02 11:40:33

Added files:
	lib/libcsi     : Makefile Symbols.list csi.c csi.h csi_dh.c 
	                 csi_dh_groups.c csi_internal.h csi_util.c 
	                 shlib_version 

Log message:
Initial version of Crypto Simplified Interface (CSI).

This is a code base that intends on providing a simplified interface for
mid-level cryptographic operations. In due course various applications and
libraries will be able to benefit from a clean and robust API, rather than
using libcrypto or other similar APIs directly.

Discussed at length with deraadt@, djm@, markus@, beck@ and others.

This parallels the addition of libtls.

p2k18 Hackathon Report: Antoine Jacoutot on GNOME and portroach

Contributed by Paul 'WEiRD' de Weerd on from the gnomes-and-hobbits dept.

Next up in the stream of p2k18 reports is one from Antoine Jacoutot (ajacoutot@):

Because there was yet another national railroad strike, I decided not to take any chance and arrived on the eve of the hackathon. I figured it would be a good excuse for a pajama party at gilles@'s. It turned out to be a great achievement… thank you mead :-)

Read more…

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OpenBSD Errata

OpenBSD 6.3

0102018-06-17 SECURITY Intel CPUs speculatively access FPU registers even when the FPU is disabled, so data (including AES keys) from previous contexts could be discovered if using the lazy-save approach.
0092018-06-14 SECURITY DSA and ECDSA signature generation can potentially leak secret information to a timing side-channel attack.
0082018-05-17 RELIABILITY A malicious packet can cause a kernel crash when using IPsec over IPv6.
0072018-05-08 RELIABILITY Incorrect checks in libcrypto can prevent Diffie-Hellman Exchange operations from working.
0062018-05-08 RELIABILITY Incorrect handling of fragmented IPsec packets could result in a system crash.
0052018-04-21 RELIABILITY httpd can leak file descriptors when servicing range requests.

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