CVE-2021-23133: Linux Kernel sctp_destroy_sock race condition
First published: Mon Apr 12 2021(Updated: )
A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.
Credit: psirt@paloaltonetworks.com psirt@paloaltonetworks.com psirt@paloaltonetworks.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-348.rt7.130.el8 | 0:4.18.0-348.rt7.130.el8 |
| redhat/kernel | <0:4.18.0-348.el8 | 0:4.18.0-348.el8 |
| redhat/Kernel | <5.12 | 5.12 |
| Linux Linux kernel | >=4.10<4.14.232 | |
| Linux Linux kernel | >=4.15<4.19.189 | |
| Linux Linux kernel | >=4.20<5.4.114 | |
| Linux Linux kernel | >=5.5<5.10.32 | |
| Linux Linux kernel | >=5.11<5.11.16 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Debian Debian Linux | =9.0 | |
| Netapp Cloud Backup | ||
| Netapp Solidfire \& Hci Management Node | ||
| Broadcom Brocade Fabric Operating System | ||
| Netapp H410c Firmware | ||
| Netapp H410c | ||
| Netapp H300s Firmware | ||
| Netapp H300s | ||
| Netapp H500s Firmware | ||
| Netapp H500s | ||
| Netapp H700s Firmware | ||
| Netapp H700s | ||
| Netapp H300e Firmware | ||
| Netapp H300e | ||
| Netapp H500e Firmware | ||
| Netapp H500e | ||
| Netapp H700e Firmware | ||
| Netapp H700e | ||
| Netapp H410s Firmware | ||
| Netapp H410s | ||
| Netapp Solidfire Baseboard Management Controller Firmware | ||
| Netapp Solidfire Baseboard Management Controller | ||
| All of | ||
| Netapp H410c Firmware | ||
| Netapp H410c | ||
| All of | ||
| Netapp H300s Firmware | ||
| Netapp H300s | ||
| All of | ||
| Netapp H500s Firmware | ||
| Netapp H500s | ||
| All of | ||
| Netapp H700s Firmware | ||
| Netapp H700s | ||
| All of | ||
| Netapp H300e Firmware | ||
| Netapp H300e | ||
| All of | ||
| Netapp H500e Firmware | ||
| Netapp H500e | ||
| All of | ||
| Netapp H700e Firmware | ||
| Netapp H700e | ||
| All of | ||
| Netapp H410s Firmware | ||
| Netapp H410s | ||
| All of | ||
| Netapp Solidfire Baseboard Management Controller Firmware | ||
| Netapp Solidfire Baseboard Management Controller | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
Remedy
To mitigate this issue, prevent the module sctp from being loaded (and this is so by default for Red Hat Enterprise Linux 8). Please see https://access.redhat.com/solutions/41278 for information on how to blacklist a kernel module to prevent it from loading automatically.
Remedy
This issue is fixed in Linux kernel 5.12-rc8.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-23133 https://nvd.nist.gov/vuln/detail/CVE-2021-23133 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b
- https://bugzilla.redhat.com/show_bug.cgi?id=1948772
- https://access.redhat.com/errata/RHSA-2021:4140
- https://access.redhat.com/errata/RHSA-2021:4356
- https://access.redhat.com/security/cve/cve-2021-23133
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b
- https://www.openwall.com/lists/oss-security/2021/04/18/2
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/
- http://www.openwall.com/lists/oss-security/2021/05/10/1
- http://www.openwall.com/lists/oss-security/2021/05/10/2
- http://www.openwall.com/lists/oss-security/2021/05/10/3
- http://www.openwall.com/lists/oss-security/2021/05/10/4
- https://security.netapp.com/advisory/ntap-20210611-0008/
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
- https://launchpad.net/bugs/cve/CVE-2021-23133
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1951582
- https://access.redhat.com/solutions/41278
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/
- https://git.kernel.org/linus/34e5b01186858b36c4d7c87e1a025071e8e2401f
- https://security-tracker.debian.org/tracker/CVE-2021-23133
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23133
- https://nvd.nist.gov/vuln/detail/CVE-2021-23133
- https://ubuntu.com/security/CVE-2021-23133
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- version/fedoraproject fedora/34
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- vendor/netapp
- canonical/netapp cloud backup
- canonical/netapp solidfire \& hci management node
- vendor/broadcom
- canonical/broadcom brocade fabric operating system
- canonical/netapp h410c firmware
- canonical/netapp h410c
- canonical/netapp h300s firmware
- canonical/netapp h300s
- canonical/netapp h500s firmware
- canonical/netapp h500s
- canonical/netapp h700s firmware
- canonical/netapp h700s
- canonical/netapp h300e firmware
- canonical/netapp h300e
- canonical/netapp h500e firmware
- canonical/netapp h500e
- canonical/netapp h700e firmware
- canonical/netapp h700e
- canonical/netapp h410s firmware
- canonical/netapp h410s
- canonical/netapp solidfire baseboard management controller firmware
- canonical/netapp solidfire baseboard management controller
- package-manager/debian