Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: require net admin for CIFS SWN netlink CIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command. The intended sender is the cifs.witness helper, but the generic-netlink operation currently has no capability flag, so any local process can send RESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness handler. The same family exposes CIFS_GENL_MCGRP_SWN without multicast-group capability flags. Register messages sent to that group include the witness registration id and, for NTLM-authenticated mounts, the username, domain, and password attributes copied from the CIFS session. An unprivileged local process should not be able to join that group and receive those messages. Require CAP_NET_ADMIN for incoming SWN_NOTIFY commands with GENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for joining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN. The cifs.witness service runs with the privileges needed for both operations.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < 9cf7eb8919344932f909b2fac76296f7656fda8daffectedfed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < 9919021a3b7974ae66a5f9915e3a48c10cfd409baffectedfed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < 969bc6370334a5b4720c5470783295d6484bbc95affectedfed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < a3238b09c58f323e40743ce174cd0ab81b5c09edaffectedfed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < a8d17d22db591099519a89f14dd24810daba74c3affectedfed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < c2397b93fbb6f44a788fff30f99be2c20cc5e50faffectedfed979a7e082bd9f25f9002c3c4f8740dacd0bc8 to < d1ebfce2c1d161186a82e77590bf7da2ea1bce91affected
Linux Linux
Default version status: affected
5.11affected0 to < 5.11unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.143 to ≤ 6.6.*unaffected6.12.92 to ≤ 6.12.*unaffected6.18.34 to ≤ 6.18.*unaffected7.0.11 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d ↗
- https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b ↗
- https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95 ↗
- https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed ↗
- https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3 ↗
- https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f ↗
- https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91 ↗