Description
The winbind plugin in pppd for ppp 2.4.4 and earlier does not check the return code from the setuid function call, which might allow local users to gain privileges by causing setuid to fail, such as exceeding PAM limits for the maximum number of user processes, which prevents the winbind NTLM authentication helper from dropping privileges.
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 | ppp | 2.4.4rel-1 | — |
| Debian 13 | ppp | 2.4.4rel-1 | — |
| Debian 12 | ppp | 2.4.4rel-1 | — |
| Debian 3.1 | ppp | 2.4.3-20050321+2sarge1 | DSA-1106 |
Advisories 1
- DSA-1106 ppp - programming error Debian Security (DSA / DLA) · Mar 9, 2026