Description
Yubico PAM Module before 2.10 performed user authentication when 'use_first_pass' PAM configuration option was not used and the module was configured as 'sufficient' in the PAM configuration. A remote attacker could use this flaw to circumvent common authentication process and obtain access to the account in question by providing a NULL value (pressing Ctrl-D keyboard sequence) as the password string.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| yubico-pam | yubico-pam | before 2.10 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | yubico-pam | 2.10-1 | — |
| Debian 13 | yubico-pam | 2.10-1 | — |
| Debian 12 | yubico-pam | 2.10-1 | — |