#VU63835 Insufficient verification of data authenticity in Linux kernel - CVE-2021-3772

Vulnerability identifier: #VU63835

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3772

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description
The vulnerability allows a remote attacker to perform a denial of service attack (DoS) on the target system.

The vulnerability exists due to insufficient verification of data authenticity in the Linux SCTP stack. A remote attacker can exploit this vulnerability to perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: before 5.15.0, 5.15.0

---

External links
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=32f8807a48ae55be0e76880cfe8607a18b5bb0df
https://bugzilla.redhat.com/show_bug.cgi?id=2000694
https://github.com/torvalds/linux/commit/32f8807a48ae55be0e76880cfe8607a18b5bb0df
https://ubuntu.com/security/CVE-2021-3772
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
https://www.debian.org/security/2022/dsa-5096

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.