Squid Web Proxy up to 4.12/5.0.3 Cache HTTPS Traffic request smuggling

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

A vulnerability was found in Squid Web Proxy up to 4.12/5.0.3 (Firewall Software). It has been declared as critical. Affected by this vulnerability is some unknown processing of the component Cache Handler. The manipulation as part of a HTTPS Traffic leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-444. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in Squid before 4.13 and 5.x before 5.0.4. Due to incorrect data validation, HTTP Request Splitting attacks may succeed against HTTP and HTTPS traffic. This leads to cache poisoning. This allows any client, including browser scripts, to bypass local security and poison the browser cache and any downstream caches with content from an arbitrary source. Squid uses a string search instead of parsing the Transfer-Encoding header to find chunked encoding. This allows an attacker to hide a second request inside Transfer-Encoding: it is interpreted by Squid as chunked and split out into a second request delivered upstream. Squid will then deliver two distinct responses to the client, corrupting any downstream caches.

The weakness was released 09/02/2020 (Website). The advisory is shared at debian.org. This vulnerability is known as CVE-2020-15811 since 07/17/2020. The attack can be launched remotely. Required for exploitation is a single authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/02/2020).

Upgrading to version 4.13 or 5.0.4 eliminates this vulnerability.

Entry connected to this vulnerability is available at 160620.

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CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-444
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Web Proxy 4.13/5.0.4

Timelineinfoedit

07/17/2020 🔍
09/02/2020 +47 days 🔍
09/02/2020 +0 days 🔍
09/02/2020 +0 days 🔍

Sourcesinfoedit

Vendor: http://www.squid-cache.org/

Advisory: debian.org
Status: Not defined

CVE: CVE-2020-15811 (🔍)
See also: 🔍

Entryinfoedit

Created: 09/02/2020 09:42 PM
Updated: 09/02/2020 09:47 PM
Changes: (18) software_type vulnerability_cwe vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a source_cve_assigned source_cve_nvd_summary
Complete: 🔍

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