Risk | Medium |
Patch available | YES |
Number of vulnerabilities | 5 |
CVE-ID | CVE-2021-20272 CVE-2021-20273 CVE-2021-20274 CVE-2021-20275 CVE-2021-20276 |
CWE-ID | CWE-617 CWE-20 CWE-476 CWE-125 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
privoxy Server applications / Web servers |
Vendor | privoxy |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
Updated: 06.03.2021
Assigned CVE-IDs and added vulnerability #5.
EUVDB-ID: #VU50973
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-2021-20272
CWE-ID:
CWE-617 - Reachable Assertion
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion within the ssplit() function when processing CGI requests. A remote attacker can send a specially crafted CGI request, trigger an assertion failure and crash the service.
Install updates from vendor's website.
Vulnerable software versionsprivoxy: 3.0 - 3.0.31
External linkshttp://lists.privoxy.org/pipermail/privoxy-announce/2021-February/000007.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.
EUVDB-ID: #VU50974
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-2021-20273
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input within the cgi_send_banner() function. A remote attacker can pass specially crafted CGI request with an invalid image type and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsprivoxy: 3.0 - 3.0.31
External linkshttp://lists.privoxy.org/pipermail/privoxy-announce/2021-February/000007.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.
EUVDB-ID: #VU50975
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-2021-20274
CWE-ID:
CWE-476 - NULL Pointer Dereference
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the socks5_connect() function, when sending empty credentials. A remote attacker can perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsprivoxy: 3.0 - 3.0.31
External linkshttp://lists.privoxy.org/pipermail/privoxy-announce/2021-February/000007.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.
EUVDB-ID: #VU50976
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-20275
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition within the chunked_body_is_complete() function. A remote attacker can send specially crafted data to the application, trigger an out-of-bounds read error and read contents of memory on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsprivoxy: 3.0 - 3.0.31
External linkshttp://lists.privoxy.org/pipermail/privoxy-announce/2021-February/000007.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.
EUVDB-ID: #VU51245
Risk: Medium
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-20276
CWE-ID:
CWE-125 - Out-of-bounds read
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition when processing patterns passed to pcre_compile() function. A remote attacker can pass specially crafted data to the application, trigger out-of-bounds read error and perform a denial of service (DoS) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsprivoxy: 3.0 - 3.0.31
External linkshttp://seclists.org/oss-sec/2021/q1/197
http://lists.privoxy.org/pipermail/privoxy-announce/2021-February/000007.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.