Описание
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and ", passing all other bytes through verbatim. This creates an encoder/decoder asymmetry: the matching parser accepts only printable ASCII (0x20–0x7E, excluding " and ), but the encoder emits any byte including CR and LF. An application that builds a structured HTTP header via cow_http_struct_hd:item/1 (or a higher-level wrapper such as cow_http_hd:wt_protocol/1) from attacker-controlled input can have \r\n injected into the serialized header value. Once on the wire, the injected CRLF terminates the current header and any following bytes are interpreted as a new header, enabling HTTP response splitting. This issue affects cowlib from 2.9.0.
| Релиз | Статус | Примечание |
|---|---|---|
| devel | not-affected | see notes |
| esm-infra-legacy/xenial | not-affected | see notes |
| esm-infra/bionic | not-affected | see notes |
| esm-infra/focal | not-affected | see notes |
| jammy | not-affected | see notes |
| noble | not-affected | see notes |
| questing | not-affected | see notes |
| resolute | not-affected | see notes |
| upstream | not-affected | see notes |
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EPSS
Связанные уязвимости
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in ninenines cowlib allows HTTP response splitting via non-VCHAR bytes in structured-fields string values. cow_http_struct_hd:escape_string/2 in cowlib only escapes \ and ", passing all other bytes through verbatim. This creates an encoder/decoder asymmetry: the matching parser accepts only printable ASCII (0x20–0x7E, excluding " and \), but the encoder emits any byte including CR and LF. An application that builds a structured HTTP header via cow_http_struct_hd:item/1 (or a higher-level wrapper such as cow_http_hd:wt_protocol/1) from attacker-controlled input can have \r\n injected into the serialized header value. Once on the wire, the injected CRLF terminates the current header and any following bytes are interpreted as a new header, enabling HTTP response splitting. This issue affects cowlib from 2.9.0.
HTTP Response Splitting via Non-VCHAR Bytes in cow_http_struct_hd:escape_string/2
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Reque ...
cowboy and gun affected by an HTTP Request/Response Splitting vulnerability
EPSS