CVE-2019-6111

medium

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).

References

https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

https://www.freebsd.org/security/advisories/FreeBSD-EN-19:10.scp.asc

https://www.exploit-db.com/exploits/46193/

https://www.debian.org/security/2019/dsa-4387

https://usn.ubuntu.com/3885-2/

https://usn.ubuntu.com/3885-1/

https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt

https://security.netapp.com/advisory/ntap-20190213-0001/

https://security.gentoo.org/glsa/201903-16

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W3YVQ2BPTOVDCFDVNC2GGF5P5ISFG37G/

https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html

https://lists.apache.org/thread.html/e47597433b351d6e01a5d68d610b4ba195743def9730e49561e8cf3f%40%3Cdev.mina.apache.org%3E

https://lists.apache.org/thread.html/d540139359de999b0f1c87d05b715be4d7d4bec771e1ae55153c5c7a%40%3Cdev.mina.apache.org%3E

https://lists.apache.org/thread.html/c7301cab36a86825359e1b725fc40304d1df56dc6d107c1fe885148b%40%3Cdev.mina.apache.org%3E

https://lists.apache.org/thread.html/c45d9bc90700354b58fb7455962873c44229841880dcb64842fa7d23%40%3Cdev.mina.apache.org%3E

https://cvsweb.openbsd.org/src/usr.bin/ssh/scp.c

https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

https://bugzilla.redhat.com/show_bug.cgi?id=1677794

https://access.redhat.com/errata/RHSA-2019:3702

http://www.securityfocus.com/bid/106741

http://www.openwall.com/lists/oss-security/2022/08/02/1

http://www.openwall.com/lists/oss-security/2019/04/18/1

http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00058.html

Details

Source: Mitre, NVD

Published: 2019-01-31

Updated: 2023-11-07

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Severity: Medium