Vulnerability Description
The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can result in Denial of Service to all clients of the proxy. This attack appear to be exploitable via Remote HTTP server responding with an X-Forwarded-For header to certain types of HTTP request. This vulnerability appears to have been fixed in 4.0.23 and later.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | < 4.0.23 |
| Debian | Debian Linux | 7.0 |
| Canonical | Ubuntu Linux | 14.04 |
Related Weaknesses (CWE)
References
- http://www.squid-cache.org/Advisories/SQUID-2018_2.txtPatchVendor Advisory
- http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patchPatchVendor Advisory
- http://www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patchPatchVendor Advisory
- https://github.com/squid-cache/squid/pull/129/filesThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00001.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00002.htmlMailing ListThird Party Advisory
- https://usn.ubuntu.com/3557-1/Third Party Advisory
- https://usn.ubuntu.com/4059-2/
- https://www.debian.org/security/2018/dsa-4122Third Party Advisory
- http://www.squid-cache.org/Advisories/SQUID-2018_2.txtPatchVendor Advisory
- http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patchPatchVendor Advisory
- http://www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patchPatchVendor Advisory
- https://github.com/squid-cache/squid/pull/129/filesThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00001.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2018/02/msg00002.htmlMailing ListThird Party Advisory
FAQ
What is CVE-2018-1000027?
CVE-2018-1000027 is a vulnerability with a CVSS score of 7.5 (HIGH). The Squid Software Foundation Squid HTTP Caching Proxy version prior to version 4.0.23 contains a NULL Pointer Dereference vulnerability in HTTP Response X-Forwarded-For header processing that can res...
How severe is CVE-2018-1000027?
CVE-2018-1000027 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-1000027?
Check the references section above for vendor advisories and patch information. Affected products include: Squid-Cache Squid, Debian Debian Linux, Canonical Ubuntu Linux.