SSRF allowlist bypass via percent-encoded host in hackney
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| benoitc | hackney | unaffected |
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| benoitc | hackney | unaffected |
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No data.
| Vendor | Product | Versions | ||||||||
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| Benoitc | Hackney |
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| Benoitc | Hackney |
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| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-pj7v-xfvx-wmjq | Hackney has SSRF allowlist bypass in hackney_url:normalize/2 via percent-encoded host |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.229% probability within 30 days)
| Type | Values Removed | Values Added |
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| Metrics |
cvssV3_1
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| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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| Description | Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery. hackney_url:normalize/2 URL-decodes the host component after the URL has been parsed into a #hackney_url{} record. OTP's uri_string:parse/1 and inet:parse_address/1 do not decode percent-escapes in the host, so a URL such as http://%31%32%37%2E%30%2E%30%2E%31/ is seen by a caller's allowlist validator with host %31%32%37%2E%30%2E%30%2E%31 (not an IP address), which passes the allowlist check. hackney's normalizer then decodes the host to 127.0.0.1 and opens a TCP connection to loopback. Because hackney:request/5 always calls hackney_url:normalize/2 with no opt-out, every request that takes a binary or list URL is affected. The same technique reaches cloud instance metadata services (169.254.169.254), RFC1918 networks, and any admin interface listening on localhost. This issue affects hackney: from 0.13.0 before 4.0.1. | |
| Title | SSRF allowlist bypass via percent-encoded host in hackney | |
| First Time appeared |
Benoitc
Benoitc hackney |
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| Weaknesses | CWE-436 CWE-918 |
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| CPEs | cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Benoitc
Benoitc hackney |
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| References |
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| Metrics |
cvssV4_0
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