Red Hat Enterprise Linux Server AUS 7.3 update for dnsmasq
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2020-25684 CVE-2020-25685 CVE-2020-25686 |
| CWE-ID | CWE-345 CWE-327 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. |
| Vulnerable software |
Red Hat Enterprise Linux Server - AUS Operating systems & Components / Operating system dnsmasq (Red Hat package) Operating systems & Components / Operating system package or component |
| Vendor | Red Hat Inc. |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Insufficient verification of data authenticity
EUVDB-ID: #VU49843
Risk: Low
CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2020-25684
CWE-ID:
CWE-345 - Insufficient Verification of Data Authenticity
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a lack of proper address/port check within the "reply_query" function. A remote attacker can perform a DNS cache poisoning attack.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 7.3
dnsmasq (Red Hat package): before 2.66-21.el7_3.3
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:7.3:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:o:red_hat:dnsmasq_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2021:0245
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. However, proof of concept for this vulnerability is available.
2) Use of a broken or risky cryptographic algorithm
EUVDB-ID: #VU49844
Risk: Low
CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2020-25685
CWE-ID:
CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a lack of query resource name (RRNAME) checks in the "reply_query" function. A remote attacker can perform a DNS cache poisoning attack.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 7.3
dnsmasq (Red Hat package): before 2.66-21.el7_3.3
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:7.3:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:o:red_hat:dnsmasq_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2021:0245
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. However, proof of concept for this vulnerability is available.
3) Insufficient verification of data authenticity
EUVDB-ID: #VU49845
Risk: Low
CVSSv4.0: 2.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2020-25686
CWE-ID:
CWE-345 - Insufficient Verification of Data Authenticity
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the affected software does not check for an existing pending request for the same name and forwards a new request. A remote attacker can perform a DNS cache poisoning attack.
MitigationInstall updates from vendor's website.
Red Hat Enterprise Linux Server - AUS: 7.3
dnsmasq (Red Hat package): before 2.66-21.el7_3.3
CPE2.3- cpe:2.3:o:red_hat:red_hat_enterprise_linux_server_-_aus:7.3:*:*:*:*:red_hat_enterprise_linux:*:*
- cpe:2.3:o:red_hat:dnsmasq_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
https://access.redhat.com/errata/RHSA-2021:0245
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. However, proof of concept for this vulnerability is available.
