Description
Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may cause a crash, information disclosure, or authentication bypass. This implementation is distributed as a patch for PPPD 0.91, and includes the affected eap.c and eap-tls.c files. Configurations that use the `refuse-app` option are unaffected.
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 | 2.4.7-2+3 | — |
| Debian 13 | ppp | 2.4.7-2+3 | — |
| Debian 12 | ppp | 2.4.7-2+3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | ppp | 2.4.7-2+2ubuntu1.1 | USN-3810-1 |
| Ubuntu 16.04 LTS | ppp | 2.4.7-1+2ubuntu1.16.04.1 | USN-3810-1 |
| Ubuntu 14.04 LTS | ppp | 2.4.5-5.1ubuntu2.3 | USN-3810-1 |
Advisories 1
- USN-3810-1 ppp vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
References
- USN-3810-1 vendor-advisory
- [oss-security] 20180611 Buffer Overflow in pppd EAP-TLS implementation mailing-list