Ubuntu update for privoxy
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 14 |
| CVE-ID | CVE-2020-35502 CVE-2021-20209 CVE-2021-20210 CVE-2021-20211 CVE-2021-20212 CVE-2021-20213 CVE-2021-20214 CVE-2021-20215 CVE-2021-20216 CVE-2021-20217 CVE-2021-20272 CVE-2021-20273 CVE-2021-20275 CVE-2021-20276 |
| CWE-ID | CWE-401 CWE-476 CWE-617 CWE-20 CWE-125 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Ubuntu Operating systems & Components / Operating system privoxy (Ubuntu package) Operating systems & Components / Operating system package or component |
| Vendor | Canonical Ltd. |
Security Bulletin
This security bulletin contains information about 14 vulnerabilities.
1) Memory leak
EUVDB-ID: #VU49170
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-2020-35502
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak when a response is buffered and the buffer limit is reached or Privoxy is running out of memory. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Memory leak
EUVDB-ID: #VU49171
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-2021-20209
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak in the show-status CGI handler when no action files are configured. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Memory leak
EUVDB-ID: #VU49172
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-2021-20210
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak in the show-status CGI handler when no filter files are configured. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Memory leak
EUVDB-ID: #VU49173
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-2021-20211
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak when client tags are active. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
5) Memory leak
EUVDB-ID: #VU49174
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-2021-20212
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak if multiple filters are executed and the last one is skipped due to a pcre error. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
6) NULL pointer dereference
EUVDB-ID: #VU49177
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-2021-20213
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, if accept-intercepted-requests is enabled. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
7) Memory leak
EUVDB-ID: #VU49175
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-2021-20214
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak in the client-tags CGI handler when client tags are configured and memory allocations fail. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
8) Memory leak
EUVDB-ID: #VU49176
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-2021-20215
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform DoS attack on the target system.
The vulnerability exists due memory leak in the show-status CGI handler when memory allocations fail. A remote attacker can force the application to leak memory and perform denial of service attack.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
9) 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
DescriptionThe 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.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
10) 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
DescriptionThe 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.
Update the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
11) Reachable Assertion
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.
Update the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
12) Input validation error
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.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
13) Out-of-bounds read
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.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
14) Out-of-bounds read
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.
MitigationUpdate the affected package privoxy to the latest version.
Vulnerable software versionsUbuntu: 14.04 - 20.10
privoxy (Ubuntu package): before 3.0.28-3ubuntu0.1
External linkshttp://ubuntu.com/security/notices/USN-4886-1
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
