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Vulnerability Details : 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.
Publish Date : 2021-04-22 Last Update Date : 2021-06-23
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- CVSS Scores & Vulnerability Types

CVSS Score
6.9
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 362

- Products Affected By CVE-2021-23133

# Product Type Vendor Product Version Update Edition Language
1 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
3 OS Linux Linux Kernel * * * * Version Details Vulnerabilities
4 OS Linux Linux Kernel 5.12 RC1 * * Version Details Vulnerabilities
5 OS Linux Linux Kernel 5.12 RC7 * * Version Details Vulnerabilities
6 OS Linux Linux Kernel 5.12 RC2 * * Version Details Vulnerabilities
7 OS Linux Linux Kernel 5.12 RC3 * * Version Details Vulnerabilities
8 OS Linux Linux Kernel 5.12 RC4 * * Version Details Vulnerabilities
9 OS Linux Linux Kernel 5.12 RC5 * * Version Details Vulnerabilities
10 OS Linux Linux Kernel 5.12 - * * Version Details Vulnerabilities
11 OS Linux Linux Kernel 5.12 RC6 * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Fedoraproject Fedora 2
Linux Linux Kernel 9

- References For CVE-2021-23133

https://lists.fedoraproject.org/archives/list/[email protected]/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/
FEDORA FEDORA-2021-a963f04012
http://www.openwall.com/lists/oss-security/2021/05/10/1
MLIST [oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets
https://lists.fedoraproject.org/archives/list/[email protected]/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/
FEDORA FEDORA-2021-8cd093f639
https://lists.fedoraproject.org/archives/list/[email protected]/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/
FEDORA FEDORA-2021-e6b4847979
https://security.netapp.com/advisory/ntap-20210611-0008/ CONFIRM
http://www.openwall.com/lists/oss-security/2021/05/10/4
MLIST [oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets
http://www.openwall.com/lists/oss-security/2021/05/10/3
MLIST [oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
MLIST [debian-lts-announce] 20210623 [SECURITY] [DLA 2690-1] linux-4.19 security update
http://www.openwall.com/lists/oss-security/2021/05/10/2
MLIST [oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp sockets
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
MLIST [debian-lts-announce] 20210623 [SECURITY] [DLA 2689-1] linux security update
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5b
CONFIRM N/A
https://www.openwall.com/lists/oss-security/2021/04/18/2
CONFIRM N/A

- Metasploit Modules Related To CVE-2021-23133

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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