5.3 CVE-2024-8508
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.
https://nvd.nist.gov/vuln/detail/CVE-2024-8508
Categories
CWE-606 : Unchecked Input for Loop Condition
The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping. Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) Do not use user-controlled data for loop conditions. Perform input validation.
CWE-1284 : Improper Validation of Specified Quantity in Input
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. Chain: Python library does not limit the resources used to process images that specify a very large number of bands (CWE-1284), leading to excessive memory consumption (CWE-789) or an integer overflow (CWE-190). lack of validation of length field leads to infinite loop lack of validation of string length fields allows memory consumption or buffer over-read
References
af854a3a-2127-422b-91ae-364da2661108
| http://www.openwall.com/lists/oss-security/2024/10/04/5 Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html Mailing List Third Party Advisory |
sep@nlnetlabs.nl
| https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt Vendor Advisory |
CPE
| cpe | start | end |
|---|---|---|
| Configuration 1 | ||
| cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* | < 1.21.1 | |
| Configuration 2 | ||
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | ||
REMEDIATION
EXPLOITS
Exploit-db.com
| id | description | date | |
|---|---|---|---|
| No known exploits | |||
POC Github
| Url |
|---|
| No known exploits |
Other Nist (github, ...)
| Url |
|---|
| No known exploits |
CAPEC
Common Attack Pattern Enumerations and Classifications
| id | description | severity |
|---|---|---|
| No entry | ||
Cybersecurity needs ?
Strengthen software security from the outset with our DevSecOps expertise
Integrate security right from the start of the software development cycle for more robust applications and greater customer confidence.
Our team of DevSecOps experts can help you secure your APIs, data pipelines, CI/CD chains, Docker containers and Kubernetes deployments.
