UBUNTU-CVE-2021-34749

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Source
https://ubuntu.com/security/CVE-2021-34749
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34749.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-34749
Upstream
Published
2021-08-18T20:15:00Z
Modified
2025-10-24T04:50:24Z
Severity
  • 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS Calculator
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A vulnerability in Server Name Identification (SNI) request filtering of Cisco Web Security Appliance (WSA), Cisco Firepower Threat Defense (FTD), and the Snort detection engine could allow an unauthenticated, remote attacker to bypass filtering technology on an affected device and exfiltrate data from a compromised host. This vulnerability is due to inadequate filtering of the SSL handshake. An attacker could exploit this vulnerability by using data from the SSL client hello packet to communicate with an external server. A successful exploit could allow the attacker to execute a command-and-control attack on a compromised host and perform additional data exfiltration attacks.

References

Affected packages

Ubuntu:14.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.6.0-0ubuntu1?arch=source&distro=trusty

Affected ranges

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

Affected versions

2.*
2.9.2.2-3
2.9.5.3-3
2.9.6.0-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.6.0-0ubuntu1",
            "binary_name": "snort"
        },
        {
            "binary_version": "2.9.6.0-0ubuntu1",
            "binary_name": "snort-common"
        },
        {
            "binary_version": "2.9.6.0-0ubuntu1",
            "binary_name": "snort-common-libraries"
        },
        {
            "binary_version": "2.9.6.0-0ubuntu1",
            "binary_name": "snort-rules-default"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34749.json"

Ubuntu:16.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.7.0-5?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.9.7.0-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.7.0-5",
            "binary_name": "snort"
        },
        {
            "binary_version": "2.9.7.0-5",
            "binary_name": "snort-common"
        },
        {
            "binary_version": "2.9.7.0-5",
            "binary_name": "snort-common-libraries"
        },
        {
            "binary_version": "2.9.7.0-5",
            "binary_name": "snort-rules-default"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34749.json"

Ubuntu:18.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.7.0-5build1?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.9.7.0-5
2.9.7.0-5build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort"
        },
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort-common"
        },
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort-common-libraries"
        },
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort-rules-default"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34749.json"

Ubuntu:20.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.7.0-5build1?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.9.7.0-5build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort"
        },
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort-common"
        },
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort-common-libraries"
        },
        {
            "binary_version": "2.9.7.0-5build1",
            "binary_name": "snort-rules-default"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34749.json"

Ubuntu:22.04:LTS / snort

Package

Name
snort
Purl
pkg:deb/ubuntu/snort@2.9.15.1-6build1?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.9.15.1-5
2.9.15.1-6
2.9.15.1-6build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.9.15.1-6build1",
            "binary_name": "snort"
        },
        {
            "binary_version": "2.9.15.1-6build1",
            "binary_name": "snort-common"
        },
        {
            "binary_version": "2.9.15.1-6build1",
            "binary_name": "snort-common-libraries"
        },
        {
            "binary_version": "2.9.15.1-6build1",
            "binary_name": "snort-rules-default"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34749.json"