Vulnerability in Broadcom Brocade Fabric Operating System
CVE-2021-23133
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.
Vulnerability class: Race Condition
EPSS: 0.005 (39.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@paloaltonetworks.com (Exploit, Patch, Mailing List, Third Party Advisory, x_refsource_MISC)
- psirt@paloaltonetworks.com (Patch, Mailing List, x_refsource_MISC, Vendor Advisory)
- psirt@paloaltonetworks.com (vendor-advisory, x_refsource_FEDORA, Third Party Advisory)
- psirt@paloaltonetworks.com (vendor-advisory, x_refsource_FEDORA, Third Party Advisory)
- psirt@paloaltonetworks.com (vendor-advisory, x_refsource_FEDORA, Third Party Advisory)
- psirt@paloaltonetworks.com (mailing-list, x_refsource_MLIST, Patch, Mailing List, Third Party Advisory)
- psirt@paloaltonetworks.com (mailing-list, x_refsource_MLIST, Patch, Mailing List, Third Party Advisory)
- psirt@paloaltonetworks.com (mailing-list, x_refsource_MLIST, Patch, Mailing List, Third Party Advisory)
- psirt@paloaltonetworks.com (mailing-list, x_refsource_MLIST, Patch, Mailing List, Third Party Advisory)
- psirt@paloaltonetworks.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-23133?
- CVE-2021-23133 is a medium-severity vulnerability in Broadcom Brocade Fabric Operating System, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.7/10. Published 2021-04-22.
- How severe is CVE-2021-23133?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2021-23133 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.