pam-u2f: CVE-2019-12209: symlink attack on u2f_keys leading to possible information leak

Debian Bug report logs - #930021
pam-u2f: CVE-2019-12209: symlink attack on u2f_keys leading to possible information leak

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: pam-u2f: CVE-2019-12209: symlink attack on u2f_keys leading to possible information leak

Date: Wed, 05 Jun 2019 12:06:04 +0200

Source: pam-u2f
Version: 1.0.7-1
Severity: important
Tags: security upstream

Hi,

The following vulnerability was published for pam-u2f.

CVE-2019-12209[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2019-12209
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-12209
[1] https://www.openwall.com/lists/oss-security/2019/06/05/1

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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