Access Restriction Bypass Affecting openssh package, versions <7.4_p1-r0

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Alpine. See How to fix? for Alpine:3.12 relevant fixed versions and status.

sshd in OpenSSH before 7.4, when privilege separation is not used, creates forwarded Unix-domain sockets as root, which might allow local users to gain privileges via unspecified vectors, related to serverloop.c.

• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
• https://www.openssh.com/txt/release-7.4
• http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10010
• https://security-tracker.debian.org/tracker/CVE-2016-10010
• https://www.exploit-db.com/exploits/40962/
• https://security.FreeBSD.org/advisories/FreeBSD-SA-17:01.openssh.asc
• https://github.com/openbsd/src/commit/c76fac666ea038753294f2ac94d310f8adece9ce
• http://packetstormsecurity.com/files/140262/OpenSSH-Local-Privilege-Escalation.html
• https://bugs.chromium.org/p/project-zero/issues/detail?id=1010
• https://security.netapp.com/advisory/ntap-20171130-0002/
• http://www.openwall.com/lists/oss-security/2016/12/19/2
• http://www.securityfocus.com/bid/94972
• http://www.securitytracker.com/id/1037490
• http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-10010
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf