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Status Candidate


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.

Related Files

HP Security Bulletin HPSBGN03638 1
Posted Aug 30, 2016
Authored by HP | Site hp.com

HP Security Bulletin HPSBGN03638 1 - Potential vulnerabilities have been identified in the lighttpd and OpenSSH version used in HPE Remote Device Access: Virtual Customer Access System (vCAS). These vulnerabilities could be exploited remotely resulting in unauthorized modification of information, denial of service (DoS), and disclosure of information. Revision 1 of this advisory.

tags | advisory, remote, denial of service, vulnerability
advisories | CVE-2015-3200, CVE-2016-0777, CVE-2016-0778
MD5 | a3cac6862f79f63897ce73f2afa22566
Apple Security Advisory 2016-03-21-5
Posted Mar 22, 2016
Authored by Apple | Site apple.com

Apple Security Advisory 2016-03-21-5 - OS X El Capitan 10.11.4 and Security Update 2016-002 is now available and addresses code execution, memory corruption, and various other vulnerabilities.

tags | advisory, vulnerability, code execution
systems | apple, osx
advisories | CVE-2014-9495, CVE-2015-0973, CVE-2015-1819, CVE-2015-3195, CVE-2015-5312, CVE-2015-5333, CVE-2015-5334, CVE-2015-7499, CVE-2015-7500, CVE-2015-7551, CVE-2015-7942, CVE-2015-8035, CVE-2015-8126, CVE-2015-8242, CVE-2015-8472, CVE-2015-8659, CVE-2016-0777, CVE-2016-0778, CVE-2016-0801, CVE-2016-0802, CVE-2016-1732, CVE-2016-1733, CVE-2016-1734, CVE-2016-1735, CVE-2016-1736, CVE-2016-1737, CVE-2016-1738, CVE-2016-1740
MD5 | 627ce9820a6da1e5027ea19b5f314b42
Gentoo Linux Security Advisory 201601-01
Posted Jan 18, 2016
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201601-1 - Multiple vulnerabilities have been found in OpenSSH, allowing attackers to leak client memory to a server, including private keys. Versions less than 7.1_p2 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | e9bda6cd4d56d2baac4316f0cdeb347f
Slackware Security Advisory - openssh Updates
Posted Jan 15, 2016
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New openssh packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | 435f7660f5906406f0ea87e79abab8da
FreeBSD Security Advisory - FreeBSD-SA-16:07.openssh
Posted Jan 15, 2016
Authored by Qualys Security Advisory Team | Site security.freebsd.org

FreeBSD Security Advisory - The OpenSSH client code contains experimental support for resuming SSH connections (roaming). The matching server code has never been shipped, but the client code was enabled by default and could be tricked by a malicious server into leaking client memory to the server, including private client user keys. A user that authenticates to a malicious or compromised server may reveal private data, including the private SSH key of the user.

tags | advisory
systems | freebsd
advisories | CVE-2016-0777
MD5 | db88bcb6e48b14664b5ad70f4388c83d
Qualys Security Advisory - OpenSSH Overflow / Leak
Posted Jan 15, 2016
Authored by Qualys Security Advisory

Since version 5.4 (released on March 8, 2010), the OpenSSH client supports an undocumented feature called roaming: if the connection to an SSH server breaks unexpectedly, and if the server supports roaming as well, the client is able to reconnect to the server and resume the suspended SSH session. Although roaming is not supported by the OpenSSH server, it is enabled by default in the OpenSSH client, and contains two vulnerabilities that can be exploited by a malicious SSH server (or a trusted but compromised server): an information leak (memory disclosure), and a buffer overflow (heap-based).

tags | advisory, overflow, vulnerability
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | 2360520b5690a162d17aeb52bbfce9f6
Red Hat Security Advisory 2016-0043-01
Posted Jan 15, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0043-01 - OpenSSH is OpenBSD's SSH protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. An information leak flaw was found in the way the OpenSSH client roaming feature was implemented. A malicious server could potentially use this flaw to leak portions of memory of a successfully authenticated OpenSSH client. A buffer overflow flaw was found in the way the OpenSSH client roaming feature was implemented. A malicious server could potentially use this flaw to execute arbitrary code on a successfully authenticated OpenSSH client if that client used certain non-default configuration options.

tags | advisory, overflow, arbitrary, protocol
systems | linux, redhat, openbsd
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | a0fc44e10d1f9f33e3f6de113c32989d
Debian Security Advisory 3446-1
Posted Jan 15, 2016
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3446-1 - The Qualys Security team discovered two vulnerabilities in the roaming code of the OpenSSH client (an implementation of the SSH protocol suite).

tags | advisory, vulnerability, protocol
systems | linux, debian
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | cf09737daf92c3e1cb7ebcfd4c63f5bf
Ubuntu Security Notice USN-2869-1
Posted Jan 14, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2869-1 - It was discovered that the OpenSSH client experimental support for resuming connections contained multiple security issues. A malicious server could use this issue to leak client memory to the server, including private client user keys.

tags | advisory
systems | linux, ubuntu
advisories | CVE-2016-0777, CVE-2016-0778
MD5 | 82bd294a865886179f34e5f0a0b66629
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