CVE-2019-6111 Information
Share on:Description
An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp the server chooses which files/directories are sent to the client. However the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed the server can manipulate subdirectories as well (for example to overwrite the .ssh/authorized_keys file).
CVSS Vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Reference
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00058.html http://www.openwall.com/lists/oss-security/2019/04/18/1 http://www.securityfocus.com/bid/106741 https://access.redhat.com/errata/RHSA-2019:3702 https://bugzilla.redhat.com/show_bug.cgi?id=1677794 https://cvsweb.openbsd.org/src/usr.bin/ssh/scp.c https://lists.apache.org/thread.html/c45d9bc90700354b58fb7455962873c44229841880dcb64842fa7d23@3Cdev.mina.apache.org3E https://lists.apache.org/thread.html/c7301cab36a86825359e1b725fc40304d1df56dc6d107c1fe885148b@3Cdev.mina.apache.org3E https://lists.apache.org/thread.html/d540139359de999b0f1c87d05b715be4d7d4bec771e1ae55153c5c7a@3Cdev.mina.apache.org3E https://lists.apache.org/thread.html/e47597433b351d6e01a5d68d610b4ba195743def9730e49561e8cf3f@3Cdev.mina.apache.org3E https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html https://lists.fedoraproject.org/archives/list/[email protected]/message/W3YVQ2BPTOVDCFDVNC2GGF5P5ISFG37G/ https://security.gentoo.org/glsa/201903-16 https://security.netapp.com/advisory/ntap-20190213-0001/ https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt https://usn.ubuntu.com/3885-1/ https://usn.ubuntu.com/3885-2/ https://www.debian.org/security/2019/dsa-4387 https://www.exploit-db.com/exploits/46193/ https://www.freebsd.org/security/advisories/FreeBSD-EN-19:10.scp.asc https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction Required
NONE
Scope
NONE
Confidentiality Impact
UNCHANGED
Integrity Impact
NONE
Availability Impact
HIGH
Base Score
NONE
Base Severity
5.9