FreeBSD Security Advisories
2020-Apr-21 16:55 UTC
FreeBSD Security Advisory FreeBSD-SA-20:11.openssl
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============================================================================FreeBSD-SA-20:11.openssl
Security Advisory
The FreeBSD Project
Topic: OpenSSL remote denial of service vulnerability
Category: contrib
Module: openssl
Announced: 2020-04-21
Credits: Bernd Edlinger
Affects: FreeBSD 12.1
Corrected: 2020-04-21 15:47:58 UTC (stable/12, 12.1-STABLE)
2020-04-21 15:53:08 UTC (releng/12.1, 12.1-RELEASE-p4)
CVE Name: CVE-2020-1967
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
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 for the Transport Layer Security (TLS) and Secure Sockets
Layer (SSL) protocols. It is also a full-strength general purpose
cryptography library.
II. Problem Description
Server or client applications that call the SSL_check_chain() function during
or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a
result of incorrect handling of the "signature_algorithms_cert" TLS
extension. The crash occurs if an invalid or unrecognized signature
algorithm is received from the peer.
III. Impact
A malicious peer could exploit the NULL pointer dereference crash, causing a
denial of service attack.
IV. Workaround
No workaround is available.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.
Perform one of the following:
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
# shutdown -r +10min "Rebooting for a security update"
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch https://security.FreeBSD.org/patches/SA-20:11/openssl.patch
# fetch https://security.FreeBSD.org/patches/SA-20:11/openssl.patch.asc
# gpg --verify openssl.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
Restart all daemons that use the library, or reboot the system.
VI. Correction details
The following list contains the correction revision numbers for each
affected branch.
Branch/path Revision
- -------------------------------------------------------------------------
stable/12/ r360147
releng/12.1/ r360150
- -------------------------------------------------------------------------
To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:
# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
<URL:https://www.openssl.org/news/secadv/20200421.txt>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1967>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc>
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Masachika ISHIZUKA
2020-Apr-22 02:41 UTC
FreeBSD Security Advisory FreeBSD-SA-20:11.openssl
> # freebsd-update fetch > # freebsd-update install > # shutdown -r +10min "Rebooting for a security update"Hi. It did not update /etc/motd from 12.1R-p3 to 12.1R-p4. % uname -a FreeBSD onion.ish.org 12.1-RELEASE-p3 FreeBSD 12.1-RELEASE-p3 GENERIC amd64 % su # freebsd-update fetch Looking up update.FreeBSD.org mirrors... 3 mirrors found. Fetching metadata signature for 12.1-RELEASE from update1.freebsd.org... done. Fetching metadata index... done. Fetching 2 metadata patches.. done. Applying metadata patches... done. Inspecting system... done. Preparing to download files... done. Fetching 17 patches.....10... done. Applying patches... done. The following files will be updated as part of updating to 12.1-RELEASE-p4: /bin/freebsd-version /boot/kernel/ipfw.ko /usr/bin/quota /usr/lib/debug/boot/kernel/ipfw.ko.debug /usr/lib/debug/usr/bin/quota.debug /usr/lib/debug/usr/lib/libssl.so.111.debug /usr/lib/debug/usr/lib32/libssl.so.111.debug /usr/lib/libssl.a /usr/lib/libssl.so.111 /usr/lib/libssl_p.a /usr/lib32/libssl.a /usr/lib32/libssl.so.111 /usr/lib32/libssl_p.a /usr/src/crypto/openssl/ssl/t1_lib.c /usr/src/sys/conf/newvers.sh /usr/src/sys/netpfil/ipfw/ip_fw2.c /usr/src/usr.bin/quota/quota.c # freebsd-update install Installing updates...ef_read_entry failed <-- It's OK because CPU is not intel. done. # dmesg | grep CPU: CPU: AMD Turion(tm) II Neo N54L Dual-Core Processor (2196.38-MHz K8-class CPU) # reboot % uname -a FreeBSD onion.ish.org 12.1-RELEASE-p3 FreeBSD 12.1-RELEASE-p3 GENERIC amd64 % su # freebsd-update fetch Looking up update.FreeBSD.org mirrors... 3 mirrors found. Fetching metadata signature for 12.1-RELEASE from update2.freebsd.org... done. Fetching metadata index... done. Inspecting system... done. Preparing to download files... done. No updates needed to update system to 12.1-RELEASE-p4. onion# uname -a FreeBSD onion.ish.org 12.1-RELEASE-p3 FreeBSD 12.1-RELEASE-p3 GENERIC amd64 -- Masachika ISHIZUKA
On 2020-04-21 18:55, FreeBSD Security Advisories wrote:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > ============================================================================> FreeBSD-SA-20:11.openssl Security Advisory > The FreeBSD Project > > Topic: OpenSSL remote denial of service vulnerability > > Category: contrib > Module: openssl > Announced: 2020-04-21 > Credits: Bernd Edlinger > Affects: FreeBSD 12.1 > Corrected: 2020-04-21 15:47:58 UTC (stable/12, 12.1-STABLE) > 2020-04-21 15:53:08 UTC (releng/12.1, 12.1-RELEASE-p4) > CVE Name: CVE-2020-1967VuXML entry indicated 11.3 as vulnerable even if original SA has Affected: 12.1 only. https://vuxml.freebsd.org/freebsd/012809ce-83f3-11ea-92ab-00163e433440.html Can you please update VuXML entry or original SA? Kind regards Miroslav Lachman