CVE-2019-18676: Buffer Overflow
First published: Tue Nov 26 2019(Updated: )
An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Squid-Cache Squid | >=3.0<=3.5.28 | |
| Squid-Cache Squid | >=4.0<=4.8 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =19.04 | |
| Canonical Ubuntu Linux | =19.10 | |
| Fedoraproject Fedora | =30 | |
| Fedoraproject Fedora | =31 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Canonical Ubuntu Linux | =16.04 | |
| debian/squid | 4.13-10+deb11u3 5.7-2+deb12u2 6.12-1 |
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Reference Links
- http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch
- https://bugzilla.suse.com/show_bug.cgi?id=1156329
- https://github.com/squid-cache/squid/pull/275
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
- https://usn.ubuntu.com/4213-1/
- https://usn.ubuntu.com/4446-1/
- https://www.debian.org/security/2020/dsa-4682
- https://launchpad.net/bugs/cve/CVE-2019-18676
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67/
- https://security-tracker.debian.org/tracker/CVE-2019-18676
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18676
- https://nvd.nist.gov/vuln/detail/CVE-2019-18676
- https://ubuntu.com/security/CVE-2019-18676
Frequently Asked Questions
What is CVE-2019-18676?
CVE-2019-18676 is an issue discovered in Squid 3.x and 4.x through 4.8, which results in a heap-based buffer overflow that can lead to Denial of Service attacks.
How severe is CVE-2019-18676?
CVE-2019-18676 has a severity rating of 7.5 (high).
How does CVE-2019-18676 impact Squid users?
CVE-2019-18676 can cause Denial of Service for all clients using the Squid proxy.
Which versions of Squid are affected by CVE-2019-18676?
Squid versions 3.x and 4.x through 4.8 are affected by CVE-2019-18676.
Where can I find more information about CVE-2019-18676?
You can find more information about CVE-2019-18676 in the Squid advisory and patches, as well as the Bugzilla entry.
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