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Graph/egress-allowlist-misuse

AntiPattern

Egress Allowlist Misuse

egress-allowlist-misuse

Egress IP allowlisting and IP-range configuration get misapplied—using wildcard ranges, omitting returned egress IPs, or misunderstanding connection-scope settings—so traffic is either over-permitted or blocked, breaking expected access controls.

Node Details

Public graph metadata

Updated6/26/2026

Connections

30 linked nodes

MATCHESSolution

In cluster, click on NETWORK ACCESS > ADD IP ADDRESS > ALLOW ACCESS FROM ANYWHERE — After adding access from anywhere in mongoDB cluster. Tension: this issue was also solved. Outcome: It will add this ip: 0.0.0.0/0 and that's all.

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provide an option to exclude Exceptions that can be ignored safely — the mentioned Monitoring Extension. Tension: find a way to provide an option. Outcome: I've created an internal Issue.

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You can configure Nginx to block any request that has an Invalid HTTP_HOST header — server { listen 80; server_name example.com;. Tension: while filtering out requests with invalid host headers at the proxy server. Outcome: return 444;.

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Header set Accept-Ranges bytes; # inside the server block — inside the server block. Tension: proxy_force_ranges on; # inside the location block. Outcome: I fixed the issue by adding those two lines to nginx `sites-enabled` website `.conf` file.

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Turn out i need to remove this step below and use public ipv4 dns address instead of public ip address for ec2_host — Test network connectivity to EC2 host. Outcome: remove this step below and use public ipv4 dns address instead of public ip address for ec2_host.

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making sure you pace your requests to stay below those limits — API rate limits. Tension: allowing room for your normal operations, too. Outcome: handle any 429 responses gracefully to retry.

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Do not toggle Block Public Access off. Re-enable block settings as appropriate and specifically allow ACLs by setting IgnorePublicAcls (or otherwise configure ACL permissions) so the existing public access behavior is preserved without disabling all block protections.

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Add the new model id/prefix to the hardcoded allowlist — in the provider's thinking-profile resolver. Outcome: Verify by re-capturing the spawned subprocess argv: it should now show the top-tier `--effort` value.

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adding new rules for inbound and outbound to go to my IP address — I managed to resolve the issue. Outcome: and then saving.

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remove this line — host all all ::1/128 ident. Tension: In your case, you also have the uncommented line:. Outcome: trying to remove this line :).

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My solution was to allow only the user the process is running under, and deny NT AUTHORITY\NETWORK. — before the code above. Tension: At first I thought I would just deny access to NT AUTHORITY\NETWORK, but the problem is that once you set up a security descriptor, everything goes from allowed by default to denied by default. Outcome: adding this before the code above.

MATCHESSolution

Configure the MicrosoftSecurityDevOps task to use an mdo.gdnconfig and provide ESLint exclusions (e.g., via ExclusionsFilePath/.eslintignore or ExclusionPatterns) so the scanner skips the affected library files/directories during Advanced Security scans.

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The solution is to redirect the 497 error to 444. — when accessing this port through http. Tension: any access through IP will be blocked.

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You have configured src_ip_ranges=['*'] — rate limiting per client determined by IP. Tension: all the IPs will be following the rules. Outcome: you can use a single IP or group of IPs by mentioning CIDR range.

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Mitigate by rate-limiting and/or blacklisting the offending IP (with awareness of proxy/tor evasion), optionally filtering/blocking suspicious payload patterns (largely ineffective if payloads vary), and/or requiring authentication for the resource and blocking offending users. For stronger protection, add detection and a challenge like CAPTCHA or place the app behind a service such as Cloudflare to handle security responses.

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Use network-side controls such as router ACLs, firewall rules, or IP allow/block lists to restrict the target device

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this piece of code was still executed — if I was hitting a URL affected by "permitAll()". Tension: permitAll() doesn't require the request to be authenticated but still hits the "doFilterInternal" code. Outcome: Found the problem.

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Context Based Restrictions (CBR), which allow you to restrict access to resources based on contexts that include IP addresses. — IBM Cloud Databases now implements Context Based Restrictions (CBR). Tension: want to restrict access to those resources only to users who come via certain IP addresses of our business locations. Outcome: create a zone with a list of included IP addresses.

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With CBR, the first step is to define a `zone`, which includes the list of IP address you want to either include or exclude. — In this example we will create a zone with a list of included IP addresses. Tension: The next step is to create a `Rule` that binds the zone to the resources you want to restrict access to. Outcome: restrict access to the API traffic of all Elasticsearch deployments.

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I found the following API function for IBM Cloud Code Engine to list egress IP addresses. — with the IBM Cloud CLI with Code Engine plugin. Outcome: The list of returned IP addresses needs to be added in the allowlist.

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Try adding the following and attempt again: — registry.addEndpoint("/ws").withSockJS();. Tension: The wildcard ("*") inside .setAllowedOriginPatterns("*") should only be used for debugging. Outcome: .setAllowedOriginPatterns("*") // <- this part is added.

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Open "Inbound". Tension: either a rule that allows java.exe to receive packets. Outcome: or a rule that allows packets to be received to the specific UDP port irrespective of the program.

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Add search to the anonymous allowlist, implement per-tool per-minute anonymous rate buckets, 500-character query caps, unique-query/node-enumeration fingerprinting, and cooldown after repeated over-limit hits.

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Wget before 1.21.1 forwards HTTP Authorization headers to different origins when following cross-origin redirects. — when following cross-origin redirects. Tension: This is a critical information-leak vulnerability that affects users who authenticate to legitimate websites and are then redirected to attacker-controlled servers.

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Use -1 for unlimited, 0 for none allowed. Outcome: Limit -1 = unlimited, 0 = none allowed.

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unbounded memory allocation (DoS) — processing a crafted ELF file.

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prevents -i and -J from being used together — adding validation in tool_getparam.c. Tension: accepting filenames from HTTP headers and using rename() on them creates a symlink-attack vector. Outcome: rejects PARAM_BAD_USE when both flags are specified.

MATCHESSolution

before `ijs_invoke_server(ijsdev->IjsServer)`. Tension: This re-applies the --permit-file-write allowlist that the IJS off-ramp currently skips. Outcome: stop using `execvp("sh","-c",server_cmd)`.

MATCHESSolution

Extend the !PROTOPT_CREDSPERREQUEST comparison to include all options that change the connection's authenticated identity. Tension: a connection-pool match predicate must include every input that affects the authenticated/authorized state. Outcome: Matches upstream fix in commit cb49e67303dbafbab1cebf4086e3ec15b7d56ee5.

MATCHESSolution

Kept the protocol mismatch as a classified close cause — Added [REDACTED] and scoped device-auth invalidation for auth-state migrations, but did not clear unrelated browser storage. Tension: The real remediation for the observed loop is closing or hard-refreshing the stale tab so it loads the current SPA bundle. Outcome: Browser harness evidence classified the failure as protocol mismatch with high confidence, while fresh navigation connected normally.

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