Link Following Affecting pam-u2f package, versions <1.0.8-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN11-PAMU2F-524228
- published4 Jun 2019
- disclosed4 Jun 2019
Introduced: 4 Jun 2019
CVE-2019-12209 (opens in a new tab)How to fix?
Upgrade Debian:11 pam-u2f to version 1.0.8-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream pam-u2f package and not the pam-u2f package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
Yubico 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.
References
- https://security-tracker.debian.org/tracker/CVE-2019-12209
- https://developers.yubico.com/pam-u2f/Release_Notes.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZCGU6UQLI3ZTW3UYCTMQW7VDL5M4LCWR/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5FOR4ADC356JPCHAJI5UXZORLC3VNBPS/
- https://github.com/Yubico/pam-u2f/commit/7db3386fcdb454e33a3ea30dcfb8e8960d4c3aa3
- http://www.openwall.com/lists/oss-security/2019/06/05/1
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00012.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00018.html
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-12209
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FOR4ADC356JPCHAJI5UXZORLC3VNBPS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZCGU6UQLI3ZTW3UYCTMQW7VDL5M4LCWR/