UBUNTU-CVE-2019-12520

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2019-12520
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-12520.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2019-12520
Related
Published
2020-04-15T20:15:00Z
Modified
2020-04-15T20:15:00Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
Details

An issue was discovered in Squid through 4.7 and 5. When receiving a request, Squid checks its cache to see if it can serve up a response. It does this by making a MD5 hash of the absolute URL of the request. If found, it servers the request. The absolute URL can include the decoded UserInfo (username and password) for certain protocols. This decoded info is prepended to the domain. This allows an attacker to provide a username that has special characters to delimit the domain, and treat the rest of the URL as a path or query string. An attacker could first make a request to their domain using an encoded username, then when a request for the target domain comes in that decodes to the exact URL, it will serve the attacker's HTML instead of the real HTML. On Squid servers that also act as reverse proxies, this allows an attacker to gain access to features that only reverse proxies can use, such as ESI.

References

Affected packages

Ubuntu:18.04:LTS / squid3

Package

Name
squid3
Purl
pkg:deb/ubuntu/squid3?arch=src?distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.5.27-1ubuntu1.7

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squid"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squid-cgi"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squid-common"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squid-dbg"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squid-purge"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squid3"
        },
        {
            "binary_version": "3.5.27-1ubuntu1.7",
            "binary_name": "squidclient"
        }
    ]
}

Ubuntu:20.04:LTS / squid

Package

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

Affected ranges

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

Affected versions

4.*

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

Ecosystem specific 

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