Local Privilege Escalation Vulnerability in JFS Filesystem of Linux Kernel
CVE-2020-27815

7.8HIGH

Key Information:

Vendor

Linux
Status
Linux Kernel
Vendor
CVE Published:
26 May 2021

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-27815?

A vulnerability exists in the JFS filesystem implementation within the Linux Kernel, which can be exploited by local attackers capable of setting extended attributes. This security flaw allows these attackers to trigger system panics, potentially causing memory corruption and escalating their privileges. Consequently, this puts confidentiality and integrity at risk, alongside threatening overall system availability. Systems running unpatched versions of the Linux Kernel may be particularly susceptible.

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Affected Version(s)

Linux Kernel 5.9.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

linux-4.19.72_CVE-2020-27815
Created by Trinadh465

References

http://www.openwall.com/lists/oss-security/2020/11/30/5
mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2020/12/28/1
mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4843
vendor-advisoryx_refsource_DEBIAN

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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