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Vulnerability Intelligence

CVE-2021-33909 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2021-33909

CVE-2021-33909

HIGH7.8

fs/seq_file

Published Jul 20, 2021

Modified 1 years ago

Details

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.

References

WEBhttp://packetstormsecurity.com/files/163621/Sequoia-A-Deep-Root-In-Linuxs-Filesystem-Layer.html WEBhttp://packetstormsecurity.com/files/163671/Kernel-Live-Patch-Security-Notice-LSN-0079-1.html WEBhttp://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html WEBhttp://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html WEBhttp://www.openwall.com/lists/oss-security/2021/07/22/7 WEBhttp://www.openwall.com/lists/oss-security/2021/08/25/10 WEBhttp://www.openwall.com/lists/oss-security/2021/09/17/2 WEBhttp://www.openwall.com/lists/oss-security/2021/09/17/4 WEBhttp://www.openwall.com/lists/oss-security/2021/09/21/1 WEBhttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4 WEBhttps://github.com/torvalds/linux/commit/8cae8cd89f05f6de223d63e6d15e31c8ba9cf53b WEBhttps://lists.debian.org/debian-lts-announce/2021/07/msg00014.html WEBhttps://lists.debian.org/debian-lts-announce/2021/07/msg00015.html WEBhttps://lists.debian.org/debian-lts-announce/2021/07/msg00016.html ADVISORYhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z4UHHIGISO3FVRF4CQNJS4IKA25ATSFU/WEBhttps://psirt.global.sonicwall.com/vuln-detail/SNWLID-2022-0015 WEBhttps://security.netapp.com/advisory/ntap-20210819-0004/ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2021-33909 ADVISORYhttps://www.debian.org/security/2021/dsa-4941 WEBhttps://www.openwall.com/lists/oss-security/2021/07/20/1 WEBhttps://www.oracle.com/security-alerts/cpujan2022.html

CVSS Analysis

CVSS v3.1

7.8

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

LowPR:L

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

7.8/CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Ecosystems

Timeline

PublishedJul 20, 2021

ModifiedAug 4, 2024