Multiple vulnerabilities in Squid

1) Resource management error

EUVDB-ID: #VU29389

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14059

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to incorrect synchronization when processing objects in an SMP cache. A remote client trigger a Squid worker assertion and perform a denial of service (DoS) attack.

This attack is limited to SMP Squids using shared memory cache and/or an SMP rock disk cache.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Squid: 5.0.1 - 5.0.2

External links

http://github.com/squid-cache/squid/security/advisories/GHSA-w7pw-2m4p-58hr

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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) Exposed dangerous method or function

EUVDB-ID: #VU29390

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14058

CWE-ID: CWE-749 - Exposed Dangerous Method or Function

Exploit availability: No

Description

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

The vulnerability exists due to usage of potentially dangerous function when processing TLS certificates. A remote client can perform a denial of service attack when opening TLS connections.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Squid: 3.1 - 5.0.2

External links

http://github.com/squid-cache/squid/security/advisories/GHSA-qvf6-485q-vm57

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.

3) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU29391

Risk: Medium

CVSSv3.1: 4.3 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15049

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform cache poisoning attack.

The vulnerability exists in the way Squid processes client's requests. A remote client can send specially crafted data in the request to perform request smuggling and poison the HTTP cache contents with crafted HTTP(S) request messages.

Successful exploitation of the vulnerability requires an upstream server to participate in the smuggling and generate the poison response sequence.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Squid: 2.0 - 5.0.2

External links

http://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.