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CVE-2019-12209

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Date: June 4, 2019

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.

Language: C

Severity Score

Related Resources (13)

http://www.openwall.com/lists/oss-security/2019/06/05/1
https://security-tracker.debian.org/tracker/CVE-2019-12209
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5FOR4ADC356JPCHAJI5UXZORLC3VNBPS/
https://people.canonical.com/~ubuntu-security/cve/CVE-2019-12209
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00012.html
https://github.com/Yubico/pam-u2f/commit/7db3386fcdb454e33a3ea30dcfb8e8960d4c3aa3
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZCGU6UQLI3ZTW3UYCTMQW7VDL5M4LCWR/
https://nvd.nist.gov/vuln/detail/CVE-2019-12209
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00018.html
https://developers.yubico.com/pam-u2f/Release_Notes.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FOR4ADC356JPCHAJI5UXZORLC3VNBPS/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZCGU6UQLI3ZTW3UYCTMQW7VDL5M4LCWR/
https://www.mend.io/vulnerability-database/CVE-2019-12209

Severity Score

Weakness Type (CWE)

Information Leak / Disclosure

CWE-200

Link Following

CWE-59

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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