The EAP-pwd implementation in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reassembly state properly for a case where an unexpected fragment could be received. This could result in process termination due to a NULL pointer dereference (denial of service). This affects eap_server/eap_server_pwd.c and eap_peer/eap_pwd.c.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Hostapd | W1.fi | * | 2.8 (excluding) |
| Wpa_supplicant | W1.fi | * | 2.8 (excluding) |
| Wpa | Ubuntu | bionic | * |
| Wpa | Ubuntu | cosmic | * |
| Wpa | Ubuntu | devel | * |
| Wpa | Ubuntu | disco | * |
| Wpa | Ubuntu | esm-infra-legacy/trusty | * |
| Wpa | Ubuntu | esm-infra/bionic | * |
| Wpa | Ubuntu | esm-infra/xenial | * |
| Wpa | Ubuntu | trusty/esm | * |
| Wpa | Ubuntu | upstream | * |
| Wpa | Ubuntu | xenial | * |
Potential Mitigations
References
- http://www.openwall.com/lists/oss-security/2019/04/26/1
- https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5T7G763UECWR7FQXOJVL67PW7C5A3SA4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJKZHAT5KPUN26JL77EUH563GAH5XZ5C/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZQVDEIGVZD/
- https://seclists.org/bugtraq/2019/May/40
- https://seclists.org/bugtraq/2019/May/64
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc
- https://security.gentoo.org/glsa/201908-25
- https://usn.ubuntu.com/3969-1/
- https://usn.ubuntu.com/3969-2/
- https://w1.fi/security/2019-5/
- https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt
- https://www.debian.org/security/2019/dsa-4450
- https://www.openwall.com/lists/oss-security/2019/04/18/6
- http://www.openwall.com/lists/oss-security/2019/04/26/1
- https://lists.debian.org/debian-lts-announce/2019/07/msg00030.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5T7G763UECWR7FQXOJVL67PW7C5A3SA4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DJKZHAT5KPUN26JL77EUH563GAH5XZ5C/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IQ6P2GI5GSXRNLNIUNPARFZQVDEIGVZD/
- https://seclists.org/bugtraq/2019/May/40
- https://seclists.org/bugtraq/2019/May/64
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:03.wpa.asc
- https://security.gentoo.org/glsa/201908-25
- https://usn.ubuntu.com/3969-1/
- https://usn.ubuntu.com/3969-2/
- https://w1.fi/security/2019-5/
- https://w1.fi/security/2019-5/eap-pwd-message-reassembly-issue-with-unexpected-fragment.txt
- https://www.debian.org/security/2019/dsa-4450
- https://www.openwall.com/lists/oss-security/2019/04/18/6