CVE-2019-6109

NameCVE-2019-6109
DescriptionAn issue was discovered in OpenSSH 7.9. Due to missing character encoding in the progress display, a malicious server (or Man-in-The-Middle attacker) can employ crafted object names to manipulate the client output, e.g., by using ANSI control codes to hide additional files being transferred. This affects refresh_progress_meter() in progressmeter.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4387-1
NVD severitymedium (attack range: remote)
Debian Bugs793412

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssh (PTS)jessie1:6.7p1-5+deb8u4vulnerable
jessie (security)1:6.7p1-5+deb8u7vulnerable
stretch (security), stretch1:7.4p1-10+deb9u5fixed
buster, sid1:7.9p1-6fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensshsource(unstable)1:7.9p1-6medium793412
opensshsourcestretch1:7.4p1-10+deb9u5mediumDSA-4387-1

Notes

https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
https://bugzilla.mindrot.org/show_bug.cgi?id=2434
Patch: https://bugzilla.mindrot.org/attachment.cgi?id=3228
Fixed by: https://github.com/openssh/openssh-portable/commit/8976f1c4b2721c26e878151f52bdf346dfe2d54c
possibly additionally needed: https://github.com/openssh/openssh-portable/commit/bdc6c63c80b55bcbaa66b5fde31c1cb1d09a41eb

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