SB2022081629 - Multiple vulnerabilities in drpoxy

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2022-33988)

The vulnerability allows a remote attacker to perform DNS cache poisoning attacks.

The vulnerability exists due to dproxy re-uses the DNS transaction id (TXID) value from client queries. A remote attacker with ability to send requests to DNS resolver can conduct DNS cache-poisoning attacks.

2) Use of insufficiently random values (CVE-ID: CVE-2022-33989)

The vulnerability allows a remote attacker to perform DNS cache poisoning attacks.

The vulnerability exists due to dproxy uses a static UDP source port, which is selected randomly only at boot time, in upstream queries sent to DNS resolvers. A remote attacker can conduct DNS cache-poisoning attacks.

3) Input validation error (CVE-ID: CVE-2022-33990)

The vulnerability allows a remote attacker to perform DNS cache poisoning attacks.

The vulnerability exists due to insufficient validation of special domain name characters. A remote attacker can send specially crafted input to the application and perform DNS cache poisoning attacks.

4) Insecure configuration (CVE-ID: CVE-2022-33991)

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to dproxy forwards and caches DNS queries with the CD (aka checking disabled) bit set to 1, which in turn disables DNSSEC protection provided by upstream resolvers and allows to perform DNS cache poisoning.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://www.usenix.org/conference/usenixsecurity22/presentation/jeitner
• https://www.openwall.com/lists/oss-security/2022/08/14/3
• https://www.usenix.org/conference/usenixsecurity21/presentation/jeitner