Resource management error in Squid-cache Squid



| Updated: 2020-08-11
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2011-4096
CWE-ID CWE-399
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 one medium risk vulnerability.

1) Resource management error

EUVDB-ID: #VU44514

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-4096

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The idnsGrokReply function in Squid before 3.1.16 does not properly free memory, which allows remote attackers to cause a denial of service (daemon abort) via a DNS reply containing a CNAME record that references another CNAME record that contains an empty A record.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Squid: 3.0.stable1 - 3.1.14

CPE2.3 External links

https://bugs.squid-cache.org/show_bug.cgi?id=3237#c12
https://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
https://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
https://secunia.com/advisories/46609
https://secunia.com/advisories/47459
https://www.mandriva.com/security/advisories?name=MDVSA-2011:193
https://www.openwall.com/lists/oss-security/2011/10/31/5
https://www.openwall.com/lists/oss-security/2011/11/01/3
https://www.redhat.com/support/errata/RHSA-2011-1791.html
https://www.securitytracker.com/id?1026265
https://www.squid-cache.org/Versions/v3/3.1/changesets/SQUID_3_1_16.html


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.



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