Bug 792270 – <sys-auth/pam_u2f-1.1.1: Local PIN bypass (CVE-2021-31924)

• Status: RESOLVED FIXED
• Product: Gentoo Security

[Description Sam James 2021-05-26 16:46:19 UTC]

Description:
"Yubico pam-u2f before 1.1.1 has a logic issue that, depending on the pam-u2f configuration and the application used, could lead to a local PIN bypass. This issue does not allow user presence (touch) or cryptographic signature verification to be bypassed, so an attacker would still need to physically possess and interact with the YubiKey or another enrolled authenticator. If pam-u2f is configured to require PIN authentication, and the application using pam-u2f allows the user to submit NULL as the PIN, pam-u2f will attempt to perform a FIDO2 authentication without PIN. If this authentication is successful, the PIN requirement is bypassed."

[Comment 1 Sam James 2021-05-26 16:46:55 UTC]

Please bump to 1.1.1.

[Comment 2 Larry the Git Cow 2021-06-01 18:27:00 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=61975a03862b41f57868867e8aeec85643aa4c94

commit 61975a03862b41f57868867e8aeec85643aa4c94
Author:     David Seifert <[e-mail]>
AuthorDate: 2021-06-01 18:26:45 +0000
Commit:     David Seifert <[e-mail]>
CommitDate: 2021-06-01 18:26:45 +0000

    sys-auth/pam_u2f: add 1.1.1
    
    Bug: https://bugs.gentoo.org/792270
    Signed-off-by: David Seifert <[e-mail]>

 sys-auth/pam_u2f/Manifest             |  1 +
 sys-auth/pam_u2f/pam_u2f-1.1.1.ebuild | 39 +++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

[Comment 3 Sam James 2021-06-21 07:08:22 UTC]

Ready?

[Comment 4 Sam James 2021-06-25 01:19:57 UTC]

I'll CC arches if no objections?

[Comment 5 Agostino Sarubbo 2021-06-27 05:57:44 UTC]

amd64 stable

[Comment 6 Agostino Sarubbo 2021-06-27 05:58:28 UTC]

x86 stable.

Maintainer(s), please cleanup.
Security, please vote.

[Comment 7 Larry the Git Cow 2021-07-26 03:24:57 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=1244305b9284cf3cf0527fdac223920a5de8fde9

commit 1244305b9284cf3cf0527fdac223920a5de8fde9
Author:     John Helmert III <[e-mail]>
AuthorDate: 2021-07-25 20:33:06 +0000
Commit:     John Helmert III <[e-mail]>
CommitDate: 2021-07-26 03:12:43 +0000

    sys-auth/pam_u2f: drop 1.1.0
    
    Bug: https://bugs.gentoo.org/792270
    Signed-off-by: John Helmert III <[e-mail]>

 sys-auth/pam_u2f/Manifest                          |  1 -
 .../pam_u2f/files/pam_u2f-1.0.2-fix-Makefile.patch | 13 -------
 .../files/pam_u2f-1.1.0-include-limits_h.patch     | 41 ----------------------
 sys-auth/pam_u2f/pam_u2f-1.1.0.ebuild              | 37 -------------------
 4 files changed, 92 deletions(-)

[Comment 8 John Helmert III 2022-08-09 21:16:56 UTC]

GLSA request filed.

[Comment 9 Larry the Git Cow 2022-08-10 04:18:21 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/data/glsa.git/commit/?id=32b3e4980186cdbe7f79d215b0fea80008a41a94

commit 32b3e4980186cdbe7f79d215b0fea80008a41a94
Author:     GLSAMaker <[e-mail]>
AuthorDate: 2022-08-10 04:07:59 +0000
Commit:     John Helmert III <[e-mail]>
CommitDate: 2022-08-10 04:17:32 +0000

    [ GLSA 202208-11 ] Yubico pam-u2f: Local PIN Bypass vulnerability
    
    Bug: https://bugs.gentoo.org/792270
    Signed-off-by: GLSAMaker <[e-mail]>
    Signed-off-by: John Helmert III <[e-mail]>

 glsa-202208-11.xml | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

[Comment 10 John Helmert III 2022-08-10 04:23:31 UTC]

GLSA released, all done!