| Name | 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). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-1728-1, DSA-4387-1, DSA-4387-2, ELA-94-1 |
| Debian Bugs | 923486 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| openssh (PTS) | jessie, jessie (lts) | 1:6.7p1-5+deb8u10 | fixed |
| stretch (security) | 1:7.4p1-10+deb9u6 | fixed | |
| stretch (lts), stretch | 1:7.4p1-10+deb9u9 | fixed | |
| buster (security), buster, buster (lts) | 1:7.9p1-10+deb10u4 | fixed | |
| bullseye (security), bullseye | 1:8.4p1-5+deb11u3 | fixed | |
| bookworm (security), bookworm | 1:9.2p1-2+deb12u3 | fixed | |
| sid, trixie | 1:9.9p1-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| openssh | source | wheezy | 1:6.0p1-4+deb7u11 | ELA-94-1 | ||
| openssh | source | jessie | 1:6.7p1-5+deb8u8 | DLA-1728-1 | ||
| openssh | source | stretch | 1:7.4p1-10+deb9u6 | DSA-4387-2 | ||
| openssh | source | (unstable) | 1:7.9p1-9 | 923486 |
https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
https://github.com/openssh/openssh-portable/commit/391ffc4b9d31fa1f4ad566499fef9176ff8a07dc
https://github.com/openssh/openssh-portable/commit/3d896c157c722bc47adca51a58dca859225b5874
For unstable partially fixed in 1:7.9p1-6, applied complete fix in 1:7.9p1-9.