NULL pointer dereference in Squid-Cache Squid
CVE-2018-1000027
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.129 (96.2th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.129 · newest: 0.129 · change: 0.000
Affected products
- Squid-Cache Squid
- Canonical Ubuntu Linux — versions 14.04, 16.04, 17.10
- Debian Linux — versions 7.0, 8.0, 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- usn.ubuntu.com/3557-1/ (vendor-advisory, Third Party Advisory)
- www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patch (Patch, Vendor Advisory)
- www.debian.org/security/2018/dsa-4122 (vendor-advisory, Third Party Advisory)
- www.squid-cache.org/Advisories/SQUID-2018_2.txt (Patch, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2018/02/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
- github.com/squid-cache/squid/pull/129/files (Third Party Advisory)
- www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patch (Patch, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2018/02/msg00002.html (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4059-2/ (vendor-advisory)
Frequently asked questions
- What is CVE-2018-1000027?
- CVE-2018-1000027 is a high-severity vulnerability in Squid-Cache Squid, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2018-02-09.
- How severe is CVE-2018-1000027?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-1000027 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.