Detections
Analytics
Squid 3.x < 3.5.17 / 4.x < 4.0.9 Esi.cc Multiple Vulnerabilities
critical Nessus Plugin ID 91193
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Synopsis
The remote proxy server is affected by multiple vulnerabilities.Description
According to its banner, the version of Squid running on the remote host is 3.x prior to 3.5.17 or 4.x prior to 4.0.9. It is, therefore, affected by multiple vulnerabilities :- An assertion fault exists in file esi/Esi.cc that is triggered when handling ESI responses. An unauthenticated, remote attacker can exploit this, via an HTTP server that uses specially crafted Edge Side Includes (ESI), to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-4052)
- A flaw exists in file esi/Esi.cc due to improper validation of user-supplied input when handling ESI responses. An unauthenticated, remote attacker can exploit this, via specially crafted ESI responses, to disclose sensitive stack layout information.
(CVE-2016-4053)
- A buffer overflow condition exists in file esi/Esi.cc due to improper validation of user-supplied input when handling ESI responses. An unauthenticated, remote attacker can exploit this, via specially crafted ESI responses, to cause a denial of service condition or the execution of arbitrary code. (CVE-2016-4054)
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Furthermore, the patch released to address these issues does not update the version given in the banner. If the patch has been applied properly, and the service has been restarted, then consider this to be a false positive.
Solution
Upgrade to Squid version 3.5.17 / 4.0.9 or later. Alternatively, apply the vendor-supplied patch.See Also
Plugin Details
Severity: Critical
ID: 91193
File Name: squid_4_0_9_Esi_cc.nasl
Version: 1.6
Type: remote
Family: Firewalls
Published: 5/17/2016
Updated: 2/18/2025
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.7
CVSS v2
Risk Factor: Medium
Base Score: 6.8
Temporal Score: 5
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2016-4054
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS Score Source: manual
Vulnerability Information
CPE: cpe:/a:squid-cache:squid
Required KB Items: www/squid, Settings/ParanoidReport
Exploit Ease: No known exploits are available
Patch Publication Date: 4/20/2016
Vulnerability Publication Date: 4/20/2016