How are you handling false positives from wildcard DNS and catch all responses in automated content discovery?
This content discusses challenges in automated content discovery caused by false positives from wildcard DNS and catch-all responses. The author describes a method to reduce false positives by profiling false hits through repeated requests to nonsense paths, improving the accuracy of findings. This approach increases request volume, which may impact rate-limited targets. The discussion is based on a Reddit post linking to an open-source project but does not describe a specific vulnerability or exploit.
AI Analysis
Technical Summary
The post addresses the problem of false positives in automated content discovery tools caused by wildcard DNS and catch-all HTTP responses that return similar content for many requests. The author uses a two-pass approach: first, baseline filtering by response length, then a second pass that issues requests to nonsense paths to profile false positive responses. Findings matching this profile are discarded to reduce false positives. This method improves report accuracy but roughly doubles request volume, which can be problematic for rate-limited targets. The content is a discussion of methodology rather than a security vulnerability or threat.
Potential Impact
There is no direct security impact or vulnerability described. The issue relates to the accuracy of automated content discovery tools and the risk of false positives in security assessments. False positives can lead to wasted effort or misleading reports but do not represent a direct exploitation risk.
Mitigation Recommendations
No official patch or fix is applicable as this is a methodological challenge rather than a software vulnerability. The author’s approach of profiling false positives with a second pass is a practical mitigation to improve accuracy. Users of automated discovery tools should consider similar profiling techniques to reduce false positives, balancing increased request volume against rate limiting.
How are you handling false positives from wildcard DNS and catch all responses in automated content discovery?
Description
This content discusses challenges in automated content discovery caused by false positives from wildcard DNS and catch-all responses. The author describes a method to reduce false positives by profiling false hits through repeated requests to nonsense paths, improving the accuracy of findings. This approach increases request volume, which may impact rate-limited targets. The discussion is based on a Reddit post linking to an open-source project but does not describe a specific vulnerability or exploit.
Reddit Discussion
Working on an automated assessment pipeline (mine, open source, link at the end) and hit this hard enough to want other approaches.
FFUF against a host with a catch all was returning a large volume of hits with near identical response characteristics. Baseline length filtering catches the obvious cases and breaks the moment the app returns a dynamic soft 404 that varies per request.
What I do now is a second pass that re issues requests against deliberately nonsense paths, builds a profile of what a false hit looks like on that specific host, then discards anything matching it. Findings only reach confirmed status if they survive. It matters more than usual for me because the report is written for people who will not second guess it, so a false positive that reads plausibly is worse than a missed finding.
Downside is roughly double the request volume, which hurts against anything rate limited. Smarter approach, or is that just the cost?
Links cited in this discussion
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The post addresses the problem of false positives in automated content discovery tools caused by wildcard DNS and catch-all HTTP responses that return similar content for many requests. The author uses a two-pass approach: first, baseline filtering by response length, then a second pass that issues requests to nonsense paths to profile false positive responses. Findings matching this profile are discarded to reduce false positives. This method improves report accuracy but roughly doubles request volume, which can be problematic for rate-limited targets. The content is a discussion of methodology rather than a security vulnerability or threat.
Potential Impact
There is no direct security impact or vulnerability described. The issue relates to the accuracy of automated content discovery tools and the risk of false positives in security assessments. False positives can lead to wasted effort or misleading reports but do not represent a direct exploitation risk.
Mitigation Recommendations
No official patch or fix is applicable as this is a methodological challenge rather than a software vulnerability. The author’s approach of profiling false positives with a second pass is a practical mitigation to improve accuracy. Users of automated discovery tools should consider similar profiling techniques to reduce false positives, balancing increased request volume against rate limiting.
Technical Details
- Source Type
- Subreddit
- blueteamsec+AskNetsec+Information_Security
- Reddit Score
- 0
- Discussion Level
- minimal
- Content Source
- reddit_link_post
- Post Type
- link
- Domain
- null
- Newsworthiness Assessment
- {"score":27,"reasons":["external_link","established_author","very_recent"],"isNewsworthy":true,"foundNewsworthy":[],"foundNonNewsworthy":[]}
- Has External Source
- true
- Trusted Domain
- false
Threat ID: 6a63b7d79c2644c7f86cc30c
Added to database: 07/24/2026, 19:07:03 UTC
Last enriched: 07/24/2026, 19:07:09 UTC
Last updated: 07/24/2026, 19:51:52 UTC
Views: 2
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