SB20210120124 - Red Hat Enterprise Linux 7.7 update for dnsmasq
Published: January 20, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Insufficient verification of data authenticity (CVE-ID: CVE-2020-25684)
CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity
CVSSv4: 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
The 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.
2) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2020-25685)
CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
CVSSv4: 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
The 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.
3) Insufficient verification of data authenticity (CVE-ID: CVE-2020-25686)
CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity
CVSSv4: 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
The 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.
Remediation
Install update from vendor's website.