Deserialization Vulnerability in Rails Affecting Multiple Versions
CVE-2020-8165

9.8CRITICAL

Key Information:

Vendor

Rubyonrails

Status
Https://github.com/rails/rails
Vendor
CVE Published:
19 June 2020

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 90%

What is CVE-2020-8165?

A deserialization vulnerability affects Rails versions under 5.2.4.3 and 6.0.3.1, allowing attackers to unmarshal user-supplied objects in MemCacheStore and RedisCacheStore. This could potentially enable remote code execution, posing serious security risks. Developers using affected versions are strongly advised to update to patched versions to mitigate this vulnerability.

Affected Version(s)

https://github.com/rails/rails Fixed in 5.2.4.3, 6.0.3.1

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-2020-8165
Created by masahiro331

CVE-2020-8165
Created by hybryx

cve-2020-8165-demo
Created by danielklim

References

https://hackerone.com/reports/413388
x_refsource_MISC
https://groups.google.com/g/rubyonrails-security/c/bv6fW4...
x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2020/06/msg0...
mailing-listx_refsource_MLIST

EPSS Score

90% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2020-8165 : Deserialization Vulnerability in Rails Affecting Multiple Versions