Information disclosure in pam-u2f - CVE-2019-12210

Vulnerability details

The vulnerability allows a remote authenticated user to read and manipulate data.

In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set using debug_file, that file descriptor is not closed when a new process is spawned. This leads to the file descriptor being inherited into the child process; the child process can then read from and write to it. This can leak sensitive information and also, if written to, be used to fill the disk or plant misinformation.

Affected software

How to mitigate CVE-2019-12210

External References

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00018.html
• http://www.openwall.com/lists/oss-security/2019/06/05/1
• https://developers.yubico.com/pam-u2f/Release_Notes.html
• https://github.com/Yubico/pam-u2f/commit/18b1914e32b74ff52000f10e97067e841e5fff62

Related Security Bulletins

• Multiple vulnerabilities in Yubico pam-u2f
• Arch Linux update for pam-u2f