USN-4434-1

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Source
https://ubuntu.com/security/notices/USN-4434-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4434-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4434-1
Related
Published
2020-07-23T20:09:25.005004Z
Modified
2020-07-23T20:09:25.005004Z
Summary
libvncserver vulnerabilities
Details

Ramin Farajpour Cami discovered that LibVNCServer incorrectly handled certain malformed unix socket names. A remote attacker could exploit this with a crafted socket name, leading to a denial of service, or possibly execute arbitrary code. (CVE-2019-20839)

It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 16.04 LTS. (CVE-2019-20840)

Christian Beier discovered that LibVNCServer incorrectly handled anonymous TLS connections. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-14396)

It was discovered that LibVNCServer incorrectly handled region clipping. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14397)

It was discovered that LibVNCServer did not properly reset incorrectly terminated TCP connections. A remote attacker could possibly use this issue to cause an infinite loop, resulting in a denial of service. (CVE-2020-14398)

It was discovered that LibVNCServer did not properly access byte-aligned data. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14399, CVE-2020-14400)

It was discovered that LibVNCServer incorrectly handled screen scaling on the server side. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14401)

It was discovered that LibVNCServer incorrectly handled encodings. A remote attacker could use this issue to cause LibVNCServer to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-14402, CVE-2020-14403, CVE-2020-14404)

It was discovered that LibVNCServer incorrectly handled TextChat messages. A remote attacker could possibly use this issue to cause LibVNCServer to crash, resulting in a denial of service. (CVE-2020-14405)

References

Affected packages

Ubuntu:16.04:LTS / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=src?distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.10+dfsg-3ubuntu0.16.04.5

Affected versions

0.*

0.9.10+dfsg-3
0.9.10+dfsg-3build1
0.9.10+dfsg-3ubuntu0.16.04.1
0.9.10+dfsg-3ubuntu0.16.04.2
0.9.10+dfsg-3ubuntu0.16.04.3
0.9.10+dfsg-3ubuntu0.16.04.4

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncclient1-dbg"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncclient1-dbgsym"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver-config"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver-config-dbgsym"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver-dev"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver-dev-dbgsym"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver1"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver1-dbg"
        },
        {
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.5",
            "binary_name": "libvncserver1-dbgsym"
        }
    ]
}

Ubuntu:18.04:LTS / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=src?distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.11+dfsg-1ubuntu1.3

Affected versions

0.*

0.9.11+dfsg-1
0.9.11+dfsg-1ubuntu1
0.9.11+dfsg-1ubuntu1.1
0.9.11+dfsg-1ubuntu1.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncclient1-dbg"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver-config"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver-dev"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver1"
        },
        {
            "binary_version": "0.9.11+dfsg-1ubuntu1.3",
            "binary_name": "libvncserver1-dbg"
        }
    ]
}

Ubuntu:20.04:LTS / libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.12+dfsg-9ubuntu0.2

Affected versions

0.*

0.9.11+dfsg-1.3
0.9.12+dfsg-3ubuntu3
0.9.12+dfsg-6
0.9.12+dfsg-7
0.9.12+dfsg-8
0.9.12+dfsg-9
0.9.12+dfsg-9ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "0.9.12+dfsg-9ubuntu0.2",
            "binary_name": "libvncclient1"
        },
        {
            "binary_version": "0.9.12+dfsg-9ubuntu0.2",
            "binary_name": "libvncclient1-dbgsym"
        },
        {
            "binary_version": "0.9.12+dfsg-9ubuntu0.2",
            "binary_name": "libvncserver-dev"
        },
        {
            "binary_version": "0.9.12+dfsg-9ubuntu0.2",
            "binary_name": "libvncserver1"
        },
        {
            "binary_version": "0.9.12+dfsg-9ubuntu0.2",
            "binary_name": "libvncserver1-dbgsym"
        }
    ]
}