UBUNTU-CVE-2021-21295

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Source
https://ubuntu.com/security/notices/UBUNTU-CVE-2021-21295
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21295.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-21295
Related
Published
2021-03-09T19:15:00Z
Modified
2021-03-09T19:15:00Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.60.Final there is a vulnerability that enables request smuggling. If a Content-Length header is present in the original HTTP/2 request, the field is not validated by Http2MultiplexHandler as it is propagated up. This is fine as long as the request is not proxied through as HTTP/1.1. If the request comes in as an HTTP/2 stream, gets converted into the HTTP/1.1 domain objects (HttpRequest, HttpContent, etc.) via Http2StreamFrameToHttpObjectCodecand then sent up to the child channel's pipeline and proxied through a remote peer as HTTP/1.1 this may result in request smuggling. In a proxy case, users may assume the content-length is validated somehow, which is not the case. If the request is forwarded to a backend channel that is a HTTP/1.1 connection, the Content-Length now has meaning and needs to be checked. An attacker can smuggle requests inside the body as it gets downgraded from HTTP/2 to HTTP/1.1. For an example attack refer to the linked GitHub Advisory. Users are only affected if all of this is true: HTTP2MultiplexCodec or Http2FrameCodec is used, Http2StreamFrameToHttpObjectCodec is used to convert to HTTP/1.1 objects, and these HTTP/1.1 objects are forwarded to another remote peer. This has been patched in 4.1.60.Final As a workaround, the user can do the validation by themselves by implementing a custom ChannelInboundHandler that is put in the ChannelPipeline behind Http2StreamFrameToHttpObjectCodec.

References

Affected packages

Ubuntu:Pro:14.04:LTS / netty

Package

Name
netty

Affected ranges

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

Affected versions

1:3.*

1:3.2.6.Final-2
1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:16.04:LTS / netty

Package

Name
netty
Purl
pkg:deb/ubuntu/netty@1:4.0.34-1ubuntu0.1~esm1?arch=src?distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.0.34-1ubuntu0.1~esm1

Affected versions

1:3.*

1:3.2.6.Final-2

1:4.*

1:4.0.32-1
1:4.0.33-1
1:4.0.34-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "libnetty-java": "1:4.0.34-1ubuntu0.1~esm1"
        }
    ]
}

Ubuntu:Pro:18.04:LTS / netty

Package

Name
netty
Purl
pkg:deb/ubuntu/netty@1:4.1.7-4ubuntu0.1+esm2?arch=src?distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.1.7-4ubuntu0.1+esm2

Affected versions

1:4.*

1:4.1.7-4
1:4.1.7-4ubuntu0.1~esm1
1:4.1.7-4ubuntu0.1
1:4.1.7-4ubuntu0.1+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "libnetty-java": "1:4.1.7-4ubuntu0.1+esm2"
        }
    ]
}

Ubuntu:20.04:LTS / netty

Package

Name
netty

Affected ranges

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

Affected versions

1:4.*

1:4.1.33-1
1:4.1.33-2
1:4.1.33-3
1:4.1.45-1

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}

Ubuntu:Pro:20.04:LTS / netty

Package

Name
netty
Purl
pkg:deb/ubuntu/netty@1:4.1.45-1ubuntu0.1~esm1?arch=src?distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.1.45-1ubuntu0.1~esm1

Affected versions

1:4.*

1:4.1.33-1
1:4.1.33-2
1:4.1.33-3
1:4.1.45-1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "libnetty-java": "1:4.1.45-1ubuntu0.1~esm1"
        }
    ]
}

Ubuntu:22.04:LTS / netty

Package

Name
netty
Purl
pkg:deb/ubuntu/netty@1:4.1.48-4+deb11u1build0.22.04.1?arch=src?distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:4.1.48-4+deb11u1build0.22.04.1

Affected versions

1:4.*

1:4.1.48-4

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "libnetty-java": "1:4.1.48-4+deb11u1build0.22.04.1"
        }
    ]
}

Ubuntu:24.04:LTS / netty

Package

Name
netty

Affected ranges

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

Affected versions

1:4.*

1:4.1.48-7
1:4.1.48-8
1:4.1.48-9

Ecosystem specific 

{
    "ubuntu_priority": "medium"
}