UBUNTU-CVE-2021-22890

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Source
https://ubuntu.com/security/CVE-2021-22890
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-22890.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-22890
Upstream
Downstream
Related
Published
2021-03-31T06:00:00Z
Modified
2025-07-16T07:55:01.619748Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:20.04:LTS / curl

Package

Name
curl
Purl
pkg:deb/ubuntu/curl@7.68.0-1ubuntu2.5?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
7.68.0-1ubuntu2.5

Affected versions

7.*

7.65.3-1ubuntu3
7.65.3-1ubuntu4
7.66.0-1ubuntu1
7.67.0-2ubuntu1
7.68.0-1ubuntu1
7.68.0-1ubuntu2
7.68.0-1ubuntu2.1
7.68.0-1ubuntu2.2
7.68.0-1ubuntu2.4

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "curl",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "curl-dbgsym",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl3-gnutls-dbgsym",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl3-nss-dbgsym",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl4",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl4-dbgsym",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl4-doc",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl4-gnutls-dev",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl4-nss-dev",
            "binary_version": "7.68.0-1ubuntu2.5"
        },
        {
            "binary_name": "libcurl4-openssl-dev",
            "binary_version": "7.68.0-1ubuntu2.5"
        }
    ]
}