Time-of-Check Time-of-Use Vulnerability in RAUC Update Client by Pengutronix
CVE-2020-25860

6.6MEDIUM

Key Information:

Vendor

Pengutronix

Status
Pengutronix Rauc
Vendor
CVE Published:
21 December 2020

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-25860?

The RAUC update client developed by Pengutronix is susceptible to a Time-of-Check Time-of-Use (TOCTOU) vulnerability. This occurs when signature verification on an update file is performed before the file is reopened for installation. An attacker with access to modify the update file just before installation can exploit this flaw to run arbitrary code on the affected device, potentially compromising its integrity and security.

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Affected Version(s)

Pengutronix RAUC All versions before 1.5

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.

rauc-1.5-integration
Created by rauc

References

https://github.com/rauc/rauc/security/advisories/GHSA-cgf...
x_refsource_MISC
https://www.vdoo.com/blog/cve-2020-25860-significant-vuln...
x_refsource_MISC

CVSS V3.1

Score:
6.6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability Reserved

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