pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| pyload | pyload | affected |
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| Pyload | Pyload |
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| Source | ID | Title |
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Github GHSA |
GHSA-m5x5-28jr-gpjj | pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.289% probability within 30 days)
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| Metrics |
ssvc
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| First Time appeared |
Pyload
Pyload pyload |
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| Vendors & Products |
Pyload
Pyload pyload |
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| Description | pyLoad is a free and open-source download manager written in Python. Prior to 0.5.0b3.dev101, is_global_address in src/pyload/core/utils/web/check.py relies on Python's global-address classification without examining IPv4 destinations embedded in 6to4 or NAT64 IPv6 addresses. A low-privileged user can submit an IPv6 literal through parse_urls to the pre-resolution is_global_host guard. Because host_to_ip is pinned to AF_INET, that guard does not evaluate a hostname's AAAA result. Separately, curl resolves hostnames before the pycurl PREREQFUNC in src/pyload/core/network/http/http_request.py applies the same vulnerable is_global_address check to the actual connection address, so a transition-form AAAA result can be permitted even when it terminates at an embedded loopback, private, CGNAT, or link-local IPv4 address. Exploitation requires the pyLoad host to route the applicable transition mechanism, including 6to4 on affected Python 3.9 through 3.11 deployments or NAT64 on a network with a NAT64 gateway. Successful exploitation can enable internal-network reconnaissance, timing-based confirmation, limited service disruption, or cloud metadata disclosure where the wrapped address is routable. This issue is fixed in version 0.5.0b3.dev101. | |
| Title | pyLoad: SSRF guard bypass via IPv6 6to4/NAT64 transition wrappers of internal IPs | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV3_1
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