UBUNTU-CVE-2019-12521

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Source
https://ubuntu.com/security/CVE-2019-12521
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12521.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2019-12521
Upstream
Downstream
Related
Published
2020-04-15T19:15:00Z
Modified
2025-09-08T16:45:26Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.

References

Affected packages

Ubuntu:16.04:LTS / squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.11?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.12-1ubuntu7.11

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.5.12-1ubuntu7.11",
            "binary_name": "squid"
        },
        {
            "binary_version": "3.5.12-1ubuntu7.11",
            "binary_name": "squid-cgi"
        },
        {
            "binary_version": "3.5.12-1ubuntu7.11",
            "binary_name": "squid-common"
        },
        {
            "binary_version": "3.5.12-1ubuntu7.11",
            "binary_name": "squid-purge"
        },
        {
            "binary_version": "3.5.12-1ubuntu7.11",
            "binary_name": "squid3"
        },
        {
            "binary_version": "3.5.12-1ubuntu7.11",
            "binary_name": "squidclient"
        }
    ]
}

Ubuntu:18.04:LTS / squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.6?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.27-1ubuntu1.6

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.5.27-1ubuntu1.6",
            "binary_name": "squid"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.6",
            "binary_name": "squid-cgi"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.6",
            "binary_name": "squid-common"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.6",
            "binary_name": "squid-purge"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.6",
            "binary_name": "squid3"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.6",
            "binary_name": "squidclient"
        }
    ]
}

Ubuntu:20.04:LTS / squid

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.10-1ubuntu1.1

Affected versions

4.*

4.8-1ubuntu2
4.8-1ubuntu3
4.9-2ubuntu1
4.9-2ubuntu2
4.9-2ubuntu3
4.9-2ubuntu4
4.10-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "4.10-1ubuntu1.1",
            "binary_name": "squid"
        },
        {
            "binary_version": "4.10-1ubuntu1.1",
            "binary_name": "squid-cgi"
        },
        {
            "binary_version": "4.10-1ubuntu1.1",
            "binary_name": "squid-common"
        },
        {
            "binary_version": "4.10-1ubuntu1.1",
            "binary_name": "squid-purge"
        },
        {
            "binary_version": "4.10-1ubuntu1.1",
            "binary_name": "squidclient"
        }
    ]
}