Symlink Exchange Can Allow Host Filesystem Access
CVE-2021-25741

8.8HIGH

Key Information:

Vendor

Kubernetes
Status
Kubernetes
Vendor
CVE Published:
20 September 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 33%

What is CVE-2021-25741?

A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

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Deploy the Patch

Affected Version(s)

Kubernetes <= 1.19.14

Kubernetes <= 1.20.10

Kubernetes <= 1.21.4

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.

CVE-2021-25741
Created by Betep0k

CVE-2021-25741
Created by cdxiaodong

ZigRaceExploit
Created by Glutenfree69

References

https://groups.google.com/g/kubernetes-security-announce/...
x_refsource_MISC
https://github.com/kubernetes/kubernetes/issues/104980
x_refsource_MISC
https://security.netapp.com/advisory/ntap-20211008-0006/
x_refsource_CONFIRM

EPSS Score

33% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Fabricio Voznika & Mark Wolters
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