** Project changed: ubuntu-security-certifications => usg
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https://bugs.launchpad.net/bugs/1989731
Title:
Non-root user unable to change own password if pam_pwhistory is used
Status in Ubuntu Security Guide:
New
Status in pam package in Ubuntu:
New
Bug description:
When pam_pwhistory is in use non-root users are unable to change their
passwords. In fact, they are able to change it but the system spits
out an error even though the password was indeed changed.
Reproducer:
-----------
1. created an Ubuntu/Focal VM
2. added a user 'test'
sudo adduser test # used passwd '123'
su test
3. changed the password using 'passwd' logged in as the user 'test'
passwd test # used passwd '1qaz2wsx'
4. logged out from 'test' and executed
echo 'password required pam_pwhistory.so remember=5' | sudo tee -a
/etc/pam.d/common-password
5. tried again to follow step 3 as user 'test' but the following
happens:
passwd test # used passwd '3edc4rfv' (1)
Changing password for test.
Current password:
New password:
Retype new password:
Password has been already used. Choose another.
passwd: Have exhausted maximum number of retries for service
passwd: password unchanged
However, I'm now able to log in as 'test' using the password in
(1) (the one that was supposedly not set up due to having been
already used) instead of the old one (the one that should be in
place since the change process returned an error).
6. if I comment out 'password required pam_pwhistory.so remember=5'
then I can log in as 'test' and change the password without issues
This behavior has been verified with the below package versioning:
ii libpam-cap:amd64 1:2.32-1
amd64 POSIX 1003.1e capabilities (PAM module)
ii libpam-modules:amd64 1.3.1-5ubuntu4.3
amd64 Pluggable Authentication Modules for PAM
ii libpam-modules-bin 1.3.1-5ubuntu4.3
amd64 Pluggable Authentication Modules for PAM - helper binaries
ii libpam-runtime 1.3.1-5ubuntu4.3 all
Runtime support for the PAM library
ii libpam-systemd:amd64 245.4-4ubuntu3.15
amd64 system and service manager - PAM module
ii libpam0g:amd64 1.3.1-5ubuntu4.3
amd64 Pluggable Authentication Modules library
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