CVE-2019-6111

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

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

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

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

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

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

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

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

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

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

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

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

https://lists.fedoraproject.org/archives/list/[email protected]/message/W3YVQ2BPTOVDCFDVNC2GGF5P5ISFG37G/

https://lists.apache.org/thread.html/c45d9bc90700354b[email protected]%3Cdev.mina.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cdev.mina.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cdev.mina.apache.org%3E

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

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

https://lists.apache.org/thread.html/[email protected]%3Cdev.mina.apache.org%3E

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

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

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

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

Details

Risk Information

CVSS v2

CVSS v3