Gentoo update for Privoxy



Published: 2021-07-08
Risk Medium
Patch available YES
Number of vulnerabilities 15
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-2021-20274
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
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Operating systems & Components / Operating system

Vendor Gentoo

Security Bulletin

This security bulletin contains information about 15 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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

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

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

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

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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) NULL pointer dereference

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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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: #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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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.

15) 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

Description

The 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.

Mitigation

Update the affected packages.
net-proxy/privoxy to version: 3.0.32

Vulnerable software versions

Gentoo Linux: All versions

External links

http://security.gentoo.org/
http://security.gentoo.org/glsa/202107-16


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.



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