SB2021011920 - Sophos RED firmware update for Dnsmasq

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2020-25684)

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)

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)

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.

References

• https://www.sophos.com/en-us/security-advisories/sophos-sa-20210119-red-dnspooq