CVE-2019-12209

NameCVE-2019-12209
DescriptionYubico pam-u2f 1.0.7 attempts parsing of the configured authfile (default $HOME/.config/Yubico/u2f_keys) as root (unless openasuser was enabled), and does not properly verify that the path lacks symlinks pointing to other files on the system owned by root. If the debug option is enabled in the PAM configuration, part of the file contents of a symlink target will be logged, possibly revealing sensitive information.
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)
NVD severitymedium
Debian Bugs930021

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
pam-u2f (PTS)stretch1.0.4-2vulnerable
buster1.0.7-1+deb10u1fixed
bullseye, sid1.0.8-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
pam-u2fsource(unstable)1.0.8-1low930021
pam-u2fsourcebuster1.0.7-1+deb10u1

Notes

[stretch] - pam-u2f <no-dsa> (Minor issue)
https://github.com/Yubico/pam-u2f/commit/7db3386fcdb454e33a3ea30dcfb8e8960d4c3aa3
https://www.openwall.com/lists/oss-security/2019/06/05/1

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