Description
NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.
INFO
Published Date :
2024-10-03T16:27:54.540Z
Last Modified :
2024-11-14T21:02:40.473Z
Source :
NLnet Labs
AFFECTED PRODUCTS
The following products are affected by CVE-2024-8508 vulnerability.
| Vendors | Products |
|---|---|
| Debian |
|
| Nlnetlabs |
|
| Redhat |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2024-8508.
