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Medium 5.3
Reject more queries with invalid header values
This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from authoritative servers.
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Medium 5.9
Spoofed answers can mark an authoritative non-EDNS capable
Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdiation of DNSSEC records served by that server to fail.
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Medium 5.3
ZONEMD validation can be bypassed
An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is configured with ZONEMD validation.
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Medium 5.9
Missing input validation for catalog zones
Incomplete validation of the SOA record present in a catalog zone might lead to a crash.
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Medium 5.9
Insufficient input validation in ZoneToCache
A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of the Recursor due to insuffcient input validation.
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Medium 5.3
Information about ECS zero scoped answers might leak to clients that use a specific ECS
ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;
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Medium 5.9
Insufficient validation of cookie reply
An attacker can send replies that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service. Cookies are disabled by default.
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Medium 5.9
Null pointer accces in aggressive NSEC(3) cache
A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.
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Medium 5.3
Insufficient input validation of internal webserver
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
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Medium 5.0
Concurrent modification of RPZ data can lead to denial of servce
Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider.
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Medium 5.3
Crafted zones can cause increased resource usage
By publishing and querying a crafted zone an attacker can cause allocation of large entries in the negative and aggressive NSEC(3) caches.
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Medium 5.3
Insufficient input validation of internal webserver
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
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Medium 5.3
Unbounded memory allocation by internal web server
An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.
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Medium 4.4
Insufficient validation of zonemd record
If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
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Medium 4.4
Null pointer dereference in RPZ transfer
An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.
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Medium 6.5
Crafted delegations or IP fragments can poison cached delegations in Recursor
Crafted delegations or IP fragments can poison cached delegations in Recursor.
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Medium 5.3
Crafted zones can lead to increased incoming network traffic
Crafted zones can lead to increased incoming network traffic.
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Medium 5.3
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.
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Medium 5.3
Internal logic flaw in cache management can lead to a denial of service in PowerDNS Recursor
An attacker can trigger an assertion failure by requesting crafted DNS records, waiting for them to be inserted into the records cache, then send a query with qtype set to ANY.