UBUNTU-CVE-2021-43848

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Source
https://ubuntu.com/security/CVE-2021-43848
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-43848.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-43848
Related
Published
2022-02-01T13:15:00Z
Modified
2025-01-13T10:22:38Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

h2o is an open source http server. In code prior to the 8c0eca3 commit h2o may attempt to access uninitialized memory. When receiving QUIC frames in certain order, HTTP/3 server-side implementation of h2o can be misguided to treat uninitialized memory as HTTP/3 frames that have been received. When h2o is used as a reverse proxy, an attacker can abuse this vulnerability to send internal state of h2o to backend servers controlled by the attacker or third party. Also, if there is an HTTP endpoint that reflects the traffic sent from the client, an attacker can use that reflector to obtain internal state of h2o. This internal state includes traffic of other connections in unencrypted form and TLS session tickets. This vulnerability exists in h2o server with HTTP/3 support, between commit 93af138 and d1f0f65. None of the released versions of h2o are affected by this vulnerability. There are no known workarounds. Users of unreleased versions of h2o using HTTP/3 are advised to upgrade immediately.

References

Affected packages

Ubuntu:Pro:18.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.4+dfsg-1build1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.3+dfsg-2
2.2.4+dfsg-1
2.2.4+dfsg-1build1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-3build1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-3
2.2.5+dfsg2-3build1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:22.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-6.1ubuntu2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-6
2.2.5+dfsg2-6.1
2.2.5+dfsg2-6.1ubuntu1
2.2.5+dfsg2-6.1ubuntu2

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.10 / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-8.1ubuntu3?arch=source&distro=oracular

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-8.1ubuntu3

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:24.04:LTS / h2o

Package

Name
h2o
Purl
pkg:deb/ubuntu/h2o@2.2.5+dfsg2-8.1ubuntu3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.2.5+dfsg2-7
2.2.5+dfsg2-8
2.2.5+dfsg2-8.1ubuntu1
2.2.5+dfsg2-8.1ubuntu2
2.2.5+dfsg2-8.1ubuntu3

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}