UBUNTU-CVE-2019-12522

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2019-12522
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2019-12522
Upstream
Published
2020-04-15T19:15:00Z
Modified
2026-01-20T16:44:08.369593Z
Severity
  • 4.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

An issue was discovered in Squid through 4.7. When Squid is run as root, it spawns its child processes as a lesser user, by default the user nobody. This is done via the leavesuid call. leavesuid leaves the Saved UID as 0. This makes it trivial for an attacker who has compromised the child process to escalate their privileges back to root.

References

Affected packages

Ubuntu:22.04:LTS
squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid@5.9-0ubuntu0.22.04.4?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.13-10ubuntu5
5.*
5.2-1ubuntu1
5.2-1ubuntu3
5.2-1ubuntu4
5.2-1ubuntu4.1
5.2-1ubuntu4.2
5.2-1ubuntu4.3
5.7-0ubuntu0.22.04.1
5.7-0ubuntu0.22.04.2
5.7-0ubuntu0.22.04.3
5.7-0ubuntu0.22.04.4
5.9-0ubuntu0.22.04.1
5.9-0ubuntu0.22.04.2
5.9-0ubuntu0.22.04.3
5.9-0ubuntu0.22.04.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "5.9-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "5.9-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "5.9-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "5.9-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "5.9-0ubuntu0.22.04.4"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "5.9-0ubuntu0.22.04.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"
Ubuntu:24.04:LTS
squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid@6.13-0ubuntu0.24.04.3?arch=source&distro=noble

Affected ranges

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

Affected versions

6.*
6.1-2ubuntu1
6.1-2ubuntu2
6.5-1ubuntu1
6.5-1ubuntu2
6.5-1ubuntu3
6.6-1ubuntu4
6.6-1ubuntu5
6.6-1ubuntu5.1
6.10-0ubuntu0.24.04.1
6.13-0ubuntu0.24.04.1
6.13-0ubuntu0.24.04.2
6.13-0ubuntu0.24.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "6.13-0ubuntu0.24.04.3"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "6.13-0ubuntu0.24.04.3"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "6.13-0ubuntu0.24.04.3"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "6.13-0ubuntu0.24.04.3"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "6.13-0ubuntu0.24.04.3"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "6.13-0ubuntu0.24.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"
Ubuntu:25.10
squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid@6.13-1ubuntu4.1?arch=source&distro=questing

Affected ranges

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

Affected versions

6.*
6.13-1ubuntu1
6.13-1ubuntu2
6.13-1ubuntu3
6.13-1ubuntu4
6.13-1ubuntu4.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "6.13-1ubuntu4.1"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "6.13-1ubuntu4.1"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "6.13-1ubuntu4.1"
        },
        {
            "binary_name": "squid-openssl",
            "binary_version": "6.13-1ubuntu4.1"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "6.13-1ubuntu4.1"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "6.13-1ubuntu4.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"
Ubuntu:Pro:16.04:LTS
squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.16+esm6?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

3.*
3.3.8-1ubuntu16
3.3.8-1ubuntu17
3.5.12-1ubuntu6
3.5.12-1ubuntu7
3.5.12-1ubuntu7.1
3.5.12-1ubuntu7.2
3.5.12-1ubuntu7.3
3.5.12-1ubuntu7.4
3.5.12-1ubuntu7.5
3.5.12-1ubuntu7.6
3.5.12-1ubuntu7.7
3.5.12-1ubuntu7.8
3.5.12-1ubuntu7.9
3.5.12-1ubuntu7.10
3.5.12-1ubuntu7.11
3.5.12-1ubuntu7.12
3.5.12-1ubuntu7.13
3.5.12-1ubuntu7.14
3.5.12-1ubuntu7.15
3.5.12-1ubuntu7.16
3.5.12-1ubuntu7.16+esm1
3.5.12-1ubuntu7.16+esm2
3.5.12-1ubuntu7.16+esm3
3.5.12-1ubuntu7.16+esm4
3.5.12-1ubuntu7.16+esm5
3.5.12-1ubuntu7.16+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squid3",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "3.5.12-1ubuntu7.16+esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"
Ubuntu:Pro:18.04:LTS
squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.14+esm5?arch=source&distro=esm-infra/bionic

Affected ranges

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

Affected versions

3.*
3.5.23-5ubuntu1
3.5.23-5ubuntu2
3.5.27-1ubuntu1
3.5.27-1ubuntu1.1
3.5.27-1ubuntu1.2
3.5.27-1ubuntu1.3
3.5.27-1ubuntu1.4
3.5.27-1ubuntu1.5
3.5.27-1ubuntu1.6
3.5.27-1ubuntu1.7
3.5.27-1ubuntu1.8
3.5.27-1ubuntu1.9
3.5.27-1ubuntu1.10
3.5.27-1ubuntu1.11
3.5.27-1ubuntu1.12
3.5.27-1ubuntu1.13
3.5.27-1ubuntu1.14
3.5.27-1ubuntu1.14+esm1
3.5.27-1ubuntu1.14+esm2
3.5.27-1ubuntu1.14+esm3
3.5.27-1ubuntu1.14+esm4
3.5.27-1ubuntu1.14+esm5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squid3",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "3.5.27-1ubuntu1.14+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"
Ubuntu:Pro:20.04:LTS
squid

Package

Name
squid
Purl
pkg:deb/ubuntu/squid@4.10-1ubuntu1.13+esm2?arch=source&distro=esm-infra/focal

Affected ranges

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

Affected versions

4.*
4.8-1ubuntu2
4.8-1ubuntu3
4.9-2ubuntu1
4.9-2ubuntu2
4.9-2ubuntu3
4.9-2ubuntu4
4.10-1ubuntu1
4.10-1ubuntu1.1
4.10-1ubuntu1.2
4.10-1ubuntu1.3
4.10-1ubuntu1.4
4.10-1ubuntu1.5
4.10-1ubuntu1.6
4.10-1ubuntu1.7
4.10-1ubuntu1.8
4.10-1ubuntu1.9
4.10-1ubuntu1.10
4.10-1ubuntu1.11
4.10-1ubuntu1.12
4.10-1ubuntu1.13
4.10-1ubuntu1.13+esm1
4.10-1ubuntu1.13+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "squid",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squid-cgi",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squid-common",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squid-purge",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        },
        {
            "binary_name": "squidclient",
            "binary_version": "4.10-1ubuntu1.13+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12522.json"