Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| NLnet Labs | Unbound | unaffected |
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No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nlnetlabs | Unbound |
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Vendor Solution
This issue is fixed starting with version 1.26.1
| Source | ID | Title |
|---|---|---|
Debian DSA |
DSA-6507-1 | unbound security update |
Ubuntu USN |
USN-8946-1 | Unbound vulnerabilities |
Ubuntu USN |
USN-8946-2 | Unbound vulnerabilities |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.482% probability within 30 days)
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| CPEs | cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* |
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| First Time appeared |
Nlnetlabs
Nlnetlabs unbound |
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| Vendors & Products |
Nlnetlabs
Nlnetlabs unbound |
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| Metrics |
ssvc
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| References |
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| Metrics |
threat_severity
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threat_severity
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| Description | Novel vulnerabilities to launch algorithmic complexity attacks on DNSSEC have been researched under the term 'ReTrap'. These result in degradation of service when malicious zones are used to serve the algorithmic complexity vulnerabilities. NLnet Labs Unbound up to and including 1.26.0 is vulnerable to some of them. TagTrap, where the triple(Zone, Algo, KeyTag) matching mechanism introduces a significant attack vector when resolvers handle malicious responses containing numerous mismatched DNSKEY, RRSIG, and DS record. DelegationTrap, where constructing the chain-of-trust requires iterative validation of DNSKEY and DS records from the root zone downward. For deeply nested domains, this results in significant computational overhead. NsecTrap, where responses with excessive invalid NSEC records compel the resolver to validate each one. AdditionalTrap, where Unbound by default would try to DNSSEC validate the ADDITIONAL section as well. This can be exploited to waste validation resources by malicious users. | |
| Title | Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC | |
| Weaknesses | CWE-770 | |
| References |
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| Metrics |
cvssV3_1
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