Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
0

CVE-2021-22890

Disclosure Date: April 01, 2021 •
CVE-2021-22890 CVSS v3 Base Score: 3.7
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

curl 7.63.0 to and including 7.75.0 includes vulnerability that allows a malicious HTTPS proxy to MITM a connection due to bad handling of TLS 1.3 session tickets. When using a HTTPS proxy and TLS 1.3, libcurl can confuse session tickets arriving from the HTTPS proxy but work as if they arrived from the remote server and then wrongly “short-cut” the host handshake. When confusing the tickets, a HTTPS proxy can trick libcurl to use the wrong session ticket resume for the host and thereby circumvent the server TLS certificate check and make a MITM attack to be possible to perform unnoticed. Note that such a malicious HTTPS proxy needs to provide a certificate that curl will accept for the MITMed server for an attack to work – unless curl has been told to ignore the server certificate check.

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CVSS V3 Severity and Metrics
Base Score:
3.7 Low
Impact Score:
1.4
Exploitability Score:
2.2
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector (AV):
Network
Attack Complexity (AC):
High
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
Low
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
https://github.com/curl/curl 7.63.0 to and including 7.75.0
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • broadcom,
  • debian,
  • fedoraproject,
  • haxx,
  • netapp,
  • oracle,
  • siemens,
  • splunk

Products

  • communications billing and revenue management 12.0.0.3.0,
  • debian linux 9.0,
  • essbase 21.2,
  • fabric operating system -,
  • fedora 32,
  • fedora 33,
  • fedora 34,
  • hci management node -,
  • hci storage node -,
  • libcurl,
  • sinec infrastructure network services,
  • solidfire -,
  • universal forwarder,
  • universal forwarder 9.1.0
Technical Analysis