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CVE-2020-15811

Description

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.

Risk Information

Base Score
6.5
MODERATE
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS Score
Exploitation Probability
0.251

Associated Vulnerability

VulnerabilityOS Platform
Multiple Vulnerabilities are affected in IBM Security Guardium 10.5Windows
Multiple Vulnerabilities are affected in IBM Security Guardium 10.6Windows
Multiple Vulnerabilities are affected in IBM Security Guardium 11.1Windows
Multiple Vulnerabilities are affected in IBM Security Guardium 11.2Windows
Multiple Vulnerabilities are affected in IBM Security Guardium 11.3Windows
Multiple Vulnerabilities are affected in IBM Security Guardium 11.0Windows
squid security update(DSA-4751-1) squid_4.6-1+deb10u4_i386.debLinux
squid security update(DSA-4751-1) squid_4.6-1+deb10u4_amd64.debLinux
Web proxy cache server (USN-4477-1) squid_4.10-1ubuntu1.2_amd64.debLinux
Web proxy cache server (USN-4551-1) squid_3.5.27-1ubuntu1.9_i386.debLinux
Web proxy cache server (USN-4551-1) squid_3.5.27-1ubuntu1.9_amd64.debLinux
Web proxy cache server (USN-4551-1) squid_3.5.12-1ubuntu7.15_i386.debLinux
Web proxy cache server (USN-4551-1) squid_3.5.12-1ubuntu7.15_amd64.debLinux
(RHSA-2020:4082) squid security update squid-3.5.20-17.el7_9.4.x86_64.rpmLinux
(RHSA-2020:4082) squid security update squid-migration-script-3.5.20-17.el7_9.4.x86_64.rpmLinux
(RHSA-2020:4082) squid security update squid-sysvinit-3.5.20-17.el7_9.4.x86_64.rpmLinux
Squid update (ELSA-2020-4082) squid-3.5.20-17.el7_9.4.x86_64.rpmLinux
Squid-migration-script update (ELSA-2020-4082) squid-migration-script-3.5.20-17.el7_9.4.x86_64.rpmLinux
Squid-sysvinit update (ELSA-2020-4082) squid-sysvinit-3.5.20-17.el7_9.4.x86_64.rpmLinux
(CESA-2020:4082) squid security update squid-3.5.20-17.el7_9.4.x86_64.rpmLinux
(CESA-2020:4082) squid security update squid-migration-script-3.5.20-17.el7_9.4.x86_64.rpmLinux
(CESA-2020:4082) squid security update squid-sysvinit-3.5.20-17.el7_9.4.x86_64.rpmLinux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234