Vulnerability Monitor

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CVE-2020-15049

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.9, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 2 products from squid-cache, from fedoraproject organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-06-30T18:15:12.367

Last Modified

2024-11-21T05:04:41.830

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.9 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:P/I:P/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

8.0

Impact Score

6.4

Weaknesses

Type: Primary
CWE-444

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	squid-cache	squid	≤ 2.6	Yes
Application	squid-cache	squid	≤ 3.5.28	Yes
Application	squid-cache	squid	< 4.12	Yes
Application	squid-cache	squid	< 5.0.3	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Application	squid-cache	squid	2.7	Yes
Operating System	fedoraproject	fedora	31	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html ([email protected])
http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch Patch, Vendor Advisory ([email protected])
http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patch Patch, Vendor Advisory ([email protected])
https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5 Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7/ ([email protected])
https://security.netapp.com/advisory/ntap-20210312-0001/ ([email protected])
https://usn.ubuntu.com/4551-1/ ([email protected])
https://www.debian.org/security/2020/dsa-4732 ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patch Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ7NFT6HDO7/ (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20210312-0001/ (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4551-1/ (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2020/dsa-4732 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For squid-cache's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.