Multiple vulnerabilities in Privoxy



Published: 2021-02-01 | Updated: 2021-02-07
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2021-20217
CVE-2021-20216
CWE-ID CWE-617
CWE-401
Exploitation vector Network
Public exploit N/A
Vulnerable software
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privoxy
Server applications / Web servers

Vendor privoxy

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated: 07.02.2021

Assigned CVE-IDs.

1) Reachable Assertion

EUVDB-ID: #VU50155

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20217

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion. A remote attacker can send a specially crafted CGI request to the affected server and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

privoxy: 3.0 - 3.0.30

External links

http://seclists.org/oss-sec/2021/q1/91
http://www.privoxy.org/3.0.31/user-manual/whatsnew.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.

2) Memory leak

EUVDB-ID: #VU50157

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20216

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak during decompression. A remote attacker can send specially crafted request to the web server and perform denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

privoxy: 3.0 - 3.0.30

External links

http://seclists.org/oss-sec/2021/q1/91
http://www.privoxy.org/3.0.31/user-manual/whatsnew.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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