PT-2019-2640 · Yubico+1 · Yubico Pam-U2F+1

Matthias Gerstner · Published 2019-06-04 · Updated 2024-06-15 · CVE-2019-12209

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions Yubico pam-u2f version 1.0.7

Description The issue is related to the parsing of the configured authfile by Yubico pam-u2f. It 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. The vulnerability may allow a remote attacker to disclose protected information.

Recommendations For Yubico pam-u2f version 1.0.7, consider disabling the debug option in the PAM configuration to prevent potential logging of sensitive information. Additionally, restrict access to the authfile and ensure that the path to the authfile does not contain symlinks pointing to other files on the system owned by root. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Information Disclosure

Link Following

Weakness Enumeration

CWE-200

CWE-59

Related Identifiers

BDU:2019-02526

CVE-2019-12209

OPENSUSE-SU-2019:1708-1

OPENSUSE-SU-2019:1725-1

OPENSUSE-SU-2019_1708-1

OPENSUSE-SU-2019_1725-1

OPENSUSE-SU-2024:11145-1

SUSE-SU-2019:1749-1

SUSE-SU-2019:1750-1

SUSE-SU-2019_1750-1

Affected Products

Suse

Yubico Pam-U2F

References · 34

• 🔥 http://openwall.com/lists/oss-security/2019/06/05/1 · Exploit
• https://github.com/Yubico/pam-u2f/commit/7db3386fcdb454e33a3ea30dcfb8e8960d4c3aa3 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2019:1749-1 · Vendor Advisory
• https://developers.yubico.com/pam-u2f/Release_Notes.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-12209 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-12209 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-12209 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2024:11145-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FOR4ADC356JPCHAJI5UXZORLC3VNBPS · Vendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00012.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-12209 · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-02526 · Security Note
• https://osv.dev/vulnerability/CVE-2019-12209 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2019:1725-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-12209 · Vendor Advisory