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Vulnerability Details : CVE-2021-33909

fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
Publish Date : 2021-07-20 Last Update Date : 2022-03-01
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- CVSS Scores & Vulnerability Types

CVSS Score
7.2
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 Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Overflow
CWE ID 120

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:2714: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20212714 unix
RHSA-2021:2715: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20212715 unix
RHSA-2021:2716: kpatch-patch security update (Important) oval:com.redhat.rhsa:def:20212716 unix
RHSA-2021:2725: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20212725 unix
RHSA-2021:2726: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20212726 unix
RHSA-2021:2727: kpatch-patch security update (Important) oval:com.redhat.rhsa:def:20212727 unix
RHSA-2021:2735: kernel security update (Important) oval:com.redhat.rhsa:def:20212735 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-33909

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 34 * * * Version Details Vulnerabilities
4 OS Linux Linux Kernel * * * * Version Details Vulnerabilities
5 Application Netapp Hci Management Node - * * * Version Details Vulnerabilities
6 Application Netapp Solidfire - * * * Version Details Vulnerabilities
7 Application Oracle Communications Session Border Controller 8.2 * * * Version Details Vulnerabilities
8 Application Oracle Communications Session Border Controller 8.3 * * * Version Details Vulnerabilities
9 Application Oracle Communications Session Border Controller 8.4 * * * Version Details Vulnerabilities
10 Application Oracle Communications Session Border Controller 9.0 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Fedoraproject Fedora 1
Linux Linux Kernel 1
Netapp Hci Management Node 1
Netapp Solidfire 1
Oracle Communications Session Border Controller 4

- References For CVE-2021-33909

https://www.debian.org/security/2021/dsa-4941
DEBIAN DSA-4941
https://www.oracle.com/security-alerts/cpujan2022.html
http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html
http://www.openwall.com/lists/oss-security/2021/09/17/2
MLIST [oss-security] 20210916 Containers-optimized OS (COS) membership in the linux-distros list
https://lists.debian.org/debian-lts-announce/2021/07/msg00014.html
MLIST [debian-lts-announce] 20210720 [SECURITY] [DLA 2713-1] linux security update
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
http://www.openwall.com/lists/oss-security/2021/09/17/4
MLIST [oss-security] 20210917 Re: Containers-optimized OS (COS) membership in the linux-distros list
http://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html
http://www.openwall.com/lists/oss-security/2021/09/21/1
MLIST [oss-security] 20210920 Re: Containers-optimized OS (COS) membership in the linux-distros list
https://www.openwall.com/lists/oss-security/2021/07/20/1
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4 CONFIRM
https://lists.fedoraproject.org/archives/list/[email protected]/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/
FEDORA FEDORA-2021-07dc0b3eb1
https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html
MLIST [debian-lts-announce] 20210720 [SECURITY] [DLA 2714-1] linux-4.19 security update
http://www.openwall.com/lists/oss-security/2021/08/25/10
MLIST [oss-security] 20210825 Re: CVE-2021-33909: size_t-to-int vulnerability in Linux's filesystem layer
http://www.openwall.com/lists/oss-security/2021/07/22/7
MLIST [oss-security] 20210722 Re: CVE-2021-33909: size_t-to-int vulnerability in Linux's filesystem layer
https://security.netapp.com/advisory/ntap-20210819-0004/ CONFIRM
https://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b CONFIRM
http://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html
https://lists.debian.org/debian-lts-announce/2021/07/msg00016.html
MLIST [debian-lts-announce] 20210720 [SECURITY] [DLA 2713-2] linux security update

- Metasploit Modules Related To CVE-2021-33909

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


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