Denial of Service in Squid

Published: 2018-01-23 | Updated: 2020-08-22

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-1000024 CVE-2018-1000027
CWE-ID	CWE-476
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Squid Server applications / IDS/IPS systems, Firewalls and proxy servers
Vendor	Squid-cache.org

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer derefenrece

EUVDB-ID: #VU10383

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-1000024

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect pointer handling when processing ESI responses. A remote attacker can supply a specially crafted response to the vulnerable server and trigger application crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Squid: 3.0.stable1 - 4.0.22

CPE2.3

External links

https://www.squid-cache.org/Advisories/SQUID-2018_1.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) NULL pointer derefenrece

EUVDB-ID: #VU10164