TI-2019-09115 Aliases CVE-2019-12209 GHSA-cf2r-5chq-jmm8

Yubico pam-u2f 1.0.7 attempts parsing of the configured authfile (default…

LOW 38CWE-59Published 2019-06-04 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-59 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.02807 86th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:yubico:pam-u2f:1.0.7:::::::*	1.0.7	Vulnerable	Yubico

cpe:2.3:a:yubico:pam-u2f:1.0.7:*:*:*:*:*:*:* Versions 1.0.7 Vulnerable ·Yubico

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2019-12209
2026-10-03 Alias added: GHSA-cf2r-5chq-jmm8

References

Exploit 1

[oss-security] 20190605 pam-u2f: CVE-2019-12210: debug_file file descriptor leak, CVE-2019-12209: symlink attack on u2f_keys leading to possible information leak

Patch 1

https://github.com/Yubico/pam-u2f/commit/7db3386fcdb454e33a3ea30dcfb8e8960d4c3aa3

Advisory 5

TI-2019-09116 In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set… CVSS 3.0HIGH 8.1
TI-2021-11912 Yubico pam-u2f before 1.1.1 has a logic issue that, depending on the pam-u2f… CVSS 3.1MEDIUM 6.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences