ID

VAR-201601-0029

CVE

CVE-2016-0777

TITLE

OpenSSH Client contains a client information leak vulnerability and buffer overflow

DESCRIPTION

The resend_bytes function in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2 allows remote servers to obtain sensitive information from process memory by requesting transmission of an entire buffer, as demonstrated by reading a private key. OpenSSH client code versions 5.4 through 7.1p1 contains a client information leak vulnerability that could allow an OpenSSH client to leak information not limited to but including private keys, as well as a buffer overflow in certain non-default configurations. OpenSSH is prone to an information-disclosure vulnerability. Successfully exploiting this issue allows attackers to obtain sensitive information that may aid in further attacks. This tool is an open source implementation of the SSH protocol, supports encryption of all transmissions, and can effectively prevent eavesdropping, connection hijacking, and other network-level attacks. The following versions are affected: OpenSSH 5.x, 6.x, 7.x prior to 7.1p2. ============================================================================ Ubuntu Security Notice USN-2869-1 January 14, 2016 openssh vulnerabilities ============================================================================ A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.10 - Ubuntu 15.04 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS Summary: OpenSSH could be made to expose sensitive information over the network. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: openssh-client 1:6.9p1-2ubuntu0.1 Ubuntu 15.04: openssh-client 1:6.7p1-5ubuntu1.4 Ubuntu 14.04 LTS: openssh-client 1:6.6p1-2ubuntu2.4 Ubuntu 12.04 LTS: openssh-client 1:5.9p1-5ubuntu1.8 In general, a standard system update will make all the necessary changes. Corrected: 2016-01-14 22:42:43 UTC (stable/10, 10.2-STABLE) 2016-01-14 22:45:33 UTC (releng/10.2, 10.2-RELEASE-p10) 2016-01-14 22:47:54 UTC (releng/10.1, 10.1-RELEASE-p27) 2016-01-14 22:50:35 UTC (stable/9, 9.3-STABLE) 2016-01-14 22:53:07 UTC (releng/9.3, 9.3-RELEASE-p34) CVE Name: CVE-2016-0777 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/>. The ssh(1) is client side utility used to login to remote servers. II. III. IV. Workaround The vulnerable code in the client can be completely disabled by adding 'UseRoaming no' to the global ssh_config(5) file, or to user configuration in ~/.ssh/config, or by passing -oUseRoaming=no on the command line. All current remote ssh(1) sessions need to be restared after changing the configuration file. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. 2) 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 3) 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-16:07/openssh.patch # fetch https://security.FreeBSD.org/patches/SA-16:07/openssh.patch.asc # gpg --verify openssh.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>. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/9/ r294053 releng/9.3/ r294054 stable/10/ r294049 releng/10.1/ r294051 releng/10.2/ r294052 - ------------------------------------------------------------------------- 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. Users with passphrase-less privates keys, especially in non interactive setups (automated jobs using ssh, scp, rsync+ssh etc.) are advised to update their keys if they have connected to an SSH server they don't trust. More details about identifying an attack and mitigations will be available in the Qualys Security Advisory. For the oldstable distribution (wheezy), these problems have been fixed in version 1:6.0p1-4+deb7u3. For the stable distribution (jessie), these problems have been fixed in version 1:6.7p1-5+deb8u1. For the testing distribution (stretch) and unstable distribution (sid), these problems will be fixed in a later version. Here are the details from the Slackware 14.1 ChangeLog: +--------------------------+ patches/packages/openssh-7.1p2-i486-1_slack14.1.txz: Upgraded. This update fixes an information leak and a buffer overflow. Thanks to Qualys for reporting this issue. As of version 7.0, OpenSSH has deprecated some older (and presumably less secure) algorithms, and also (by default) only allows root login by public-key, hostbased and GSSAPI authentication. Make sure that your keys and authentication method will allow you to continue accessing your system after the upgrade. The release notes for OpenSSH 7.0 list the following incompatible changes to be aware of: * Support for the legacy SSH version 1 protocol is disabled by default at compile time. * Support for the 1024-bit diffie-hellman-group1-sha1 key exchange is disabled by default at run-time. It may be re-enabled using the instructions at http://www.openssh.com/legacy.html * Support for ssh-dss, ssh-dss-cert-* host and user keys is disabled by default at run-time. These may be re-enabled using the instructions at http://www.openssh.com/legacy.html * Support for the legacy v00 cert format has been removed. * The default for the sshd_config(5) PermitRootLogin option has changed from "yes" to "prohibit-password". * PermitRootLogin=without-password/prohibit-password now bans all interactive authentication methods, allowing only public-key, hostbased and GSSAPI authentication (previously it permitted keyboard-interactive and password-less authentication if those were enabled). (* Security fix *) +--------------------------+ Where to find the new packages: +-----------------------------+ Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-) Also see the "Get Slack" section on http://slackware.com for additional mirror sites near you. Updated package for Slackware 13.0: ftp://ftp.slackware.com/pub/slackware/slackware-13.0/patches/packages/openssh-7.1p2-i486-1_slack13.0.txz Updated package for Slackware x86_64 13.0: ftp://ftp.slackware.com/pub/slackware/slackware64-13.0/patches/packages/openssh-7.1p2-x86_64-1_slack13.0.txz Updated package for Slackware 13.1: ftp://ftp.slackware.com/pub/slackware/slackware-13.1/patches/packages/openssh-7.1p2-i486-1_slack13.1.txz Updated package for Slackware x86_64 13.1: ftp://ftp.slackware.com/pub/slackware/slackware64-13.1/patches/packages/openssh-7.1p2-x86_64-1_slack13.1.txz Updated package for Slackware 13.37: ftp://ftp.slackware.com/pub/slackware/slackware-13.37/patches/packages/openssh-7.1p2-i486-1_slack13.37.txz Updated package for Slackware x86_64 13.37: ftp://ftp.slackware.com/pub/slackware/slackware64-13.37/patches/packages/openssh-7.1p2-x86_64-1_slack13.37.txz Updated package for Slackware 14.0: ftp://ftp.slackware.com/pub/slackware/slackware-14.0/patches/packages/openssh-7.1p2-i486-1_slack14.0.txz Updated package for Slackware x86_64 14.0: ftp://ftp.slackware.com/pub/slackware/slackware64-14.0/patches/packages/openssh-7.1p2-x86_64-1_slack14.0.txz Updated package for Slackware 14.1: ftp://ftp.slackware.com/pub/slackware/slackware-14.1/patches/packages/openssh-7.1p2-i486-1_slack14.1.txz Updated package for Slackware x86_64 14.1: ftp://ftp.slackware.com/pub/slackware/slackware64-14.1/patches/packages/openssh-7.1p2-x86_64-1_slack14.1.txz Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openssh-7.1p2-i586-1.txz Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openssh-7.1p2-x86_64-1.txz MD5 signatures: +-------------+ Slackware 13.0 package: 856dd9c1b10641c282f30a34b7b63bea openssh-7.1p2-i486-1_slack13.0.txz Slackware x86_64 13.0 package: 80903b0829f0284d007e7a316f2ff2da openssh-7.1p2-x86_64-1_slack13.0.txz Slackware 13.1 package: 2095d1a304a94bab44993fdb7e0781c8 openssh-7.1p2-i486-1_slack13.1.txz Slackware x86_64 13.1 package: 5bf653d7f5b4a9426ff2c5888af99f00 openssh-7.1p2-x86_64-1_slack13.1.txz Slackware 13.37 package: 53e09b4371c045b9de1c86e0826324f9 openssh-7.1p2-i486-1_slack13.37.txz Slackware x86_64 13.37 package: cd0319ff3c574c50612d5ba2b38f2fdc openssh-7.1p2-x86_64-1_slack13.37.txz Slackware 14.0 package: 98cdc1d6ffea2a06d0c8013078681bff openssh-7.1p2-i486-1_slack14.0.txz Slackware x86_64 14.0 package: 2093f3e91a79e07f072c702a1704be73 openssh-7.1p2-x86_64-1_slack14.0.txz Slackware 14.1 package: d051d9f31cd380436ad01fa1641be1c7 openssh-7.1p2-i486-1_slack14.1.txz Slackware x86_64 14.1 package: f1f81757431c3c836f06ce5d22e2d5de openssh-7.1p2-x86_64-1_slack14.1.txz Slackware -current package: 70db20c5e4152bc9967b1e24cf91ed98 n/openssh-7.1p2-i586-1.txz Slackware x86_64 -current package: e13dc3da27f817bee693fbb907015817 n/openssh-7.1p2-x86_64-1.txz Installation instructions: +------------------------+ Upgrade the package as root: # upgradepkg openssh-7.1p2-i486-1_slack14.1.txz Next, restart the sshd daemon: # sh /etc/rc.d/rc.sshd restart Then before logging out, make sure that you still have remote access! See the information about incompatible changes in OpenSSH 7.x above. +-----+ Slackware Linux Security Team http://slackware.com/gpg-key security@slackware.com +------------------------------------------------------------------------+ | To leave the slackware-security mailing list: | +------------------------------------------------------------------------+ | Send an email to majordomo@slackware.com with this text in the body of | | the email message: | | | | unsubscribe slackware-security | | | | You will get a confirmation message back containing instructions to | | complete the process. Please do not reply to this email address. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: openssh security update Advisory ID: RHSA-2016:0043-01 Product: Red Hat Enterprise Linux Advisory URL: https://rhn.redhat.com/errata/RHSA-2016-0043.html Issue date: 2016-01-14 CVE Names: CVE-2016-0777 CVE-2016-0778 ===================================================================== 1. Summary: Updated openssh packages that fix two security issues are now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. (CVE-2016-0778) Red Hat would like to thank Qualys for reporting these issues. All openssh users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically. 4. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 5. Package List: Red Hat Enterprise Linux Client (v. 7): Source: openssh-6.6.1p1-23.el7_2.src.rpm x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: openssh-6.6.1p1-23.el7_2.src.rpm x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: openssh-6.6.1p1-23.el7_2.src.rpm ppc64: openssh-6.6.1p1-23.el7_2.ppc64.rpm openssh-askpass-6.6.1p1-23.el7_2.ppc64.rpm openssh-clients-6.6.1p1-23.el7_2.ppc64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.ppc64.rpm openssh-keycat-6.6.1p1-23.el7_2.ppc64.rpm openssh-server-6.6.1p1-23.el7_2.ppc64.rpm ppc64le: openssh-6.6.1p1-23.el7_2.ppc64le.rpm openssh-askpass-6.6.1p1-23.el7_2.ppc64le.rpm openssh-clients-6.6.1p1-23.el7_2.ppc64le.rpm openssh-debuginfo-6.6.1p1-23.el7_2.ppc64le.rpm openssh-keycat-6.6.1p1-23.el7_2.ppc64le.rpm openssh-server-6.6.1p1-23.el7_2.ppc64le.rpm s390x: openssh-6.6.1p1-23.el7_2.s390x.rpm openssh-askpass-6.6.1p1-23.el7_2.s390x.rpm openssh-clients-6.6.1p1-23.el7_2.s390x.rpm openssh-debuginfo-6.6.1p1-23.el7_2.s390x.rpm openssh-keycat-6.6.1p1-23.el7_2.s390x.rpm openssh-server-6.6.1p1-23.el7_2.s390x.rpm x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: openssh-debuginfo-6.6.1p1-23.el7_2.ppc.rpm openssh-debuginfo-6.6.1p1-23.el7_2.ppc64.rpm openssh-ldap-6.6.1p1-23.el7_2.ppc64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.ppc64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc64.rpm ppc64le: openssh-debuginfo-6.6.1p1-23.el7_2.ppc64le.rpm openssh-ldap-6.6.1p1-23.el7_2.ppc64le.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.ppc64le.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.ppc64le.rpm s390x: openssh-debuginfo-6.6.1p1-23.el7_2.s390.rpm openssh-debuginfo-6.6.1p1-23.el7_2.s390x.rpm openssh-ldap-6.6.1p1-23.el7_2.s390x.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.s390x.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.s390.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.s390x.rpm x86_64: openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: openssh-6.6.1p1-23.el7_2.src.rpm x86_64: openssh-6.6.1p1-23.el7_2.x86_64.rpm openssh-askpass-6.6.1p1-23.el7_2.x86_64.rpm openssh-clients-6.6.1p1-23.el7_2.x86_64.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-keycat-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-6.6.1p1-23.el7_2.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: openssh-debuginfo-6.6.1p1-23.el7_2.i686.rpm openssh-debuginfo-6.6.1p1-23.el7_2.x86_64.rpm openssh-ldap-6.6.1p1-23.el7_2.x86_64.rpm openssh-server-sysvinit-6.6.1p1-23.el7_2.x86_64.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.i686.rpm pam_ssh_agent_auth-0.9.3-9.23.el7_2.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2016-0777 https://access.redhat.com/security/cve/CVE-2016-0778 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/articles/2123781 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2016 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iD8DBQFWmAWQXlSAg2UNWIIRAh17AJ9SiT1MA1YtOA6ctMp9jIo4e9XrFwCgkbmo nXgYWs8cZcyoTRVoriTGHQo= =1sk9 -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

information disclosure

CONFIGURATIONS

EXPLOIT AVAILABILITY

PATCH

EXTERNAL IDS