Vulnerabilities

websda.c in GoAhead WebServer 2.1.8 has insufficient nonce entropy because the nonce calculation relies on the hardcoded onceuponatimeinparadise value, which does not follow the secret-data guideline for HTTP Digest Access Authentication in RFC 7616 section 3.3 (or RFC 2617 section 3.2.1). NOTE: 2.1.8 is a version from 2003; however, the affected websda.c code appears in multiple derivative works that may be used in 2021. Recent GoAhead software is unaffected.

An issue was discovered in src/http/httpLib.c in EmbedThis Appweb Community Edition 8.2.1, allows attackers to cause a denial of service via the stream paramter to the parseUri function.

The code that performs password matching when using 'Basic' HTTP authentication does not use a constant-time memcmp and has no rate-limiting. This means that an unauthenticated network attacker can brute-force the HTTP basic password, byte-by-byte, by recording the webserver's response time until the unauthorized (401) response.

An issue was discovered in GoAhead 4.x and 5.x before 5.1.5. In the file upload filter, user form variables can be passed to CGI scripts without being prefixed with the CGI prefix. This permits tunneling untrusted environment variables into vulnerable CGI scripts.

The HTTP Digest Authentication in the GoAhead web server before 5.1.2 does not completely protect against replay attacks. This allows an unauthenticated remote attacker to bypass authentication via capture-replay if TLS is not used to protect the underlying communication channel.

Appweb before 7.2.2 and 8.x before 8.1.0, when built with CGI support, mishandles an HTTP request with a Range header that lacks an exact range. This may result in a NULL pointer dereference and cause a denial of service.

An exploitable code execution vulnerability exists in the processing of multi-part/form-data requests within the base GoAhead web server application in versions v5.0.1, v.4.1.1 and v3.6.5. A specially crafted HTTP request can lead to a use-after-free condition during the processing of this request that can be used to corrupt heap structures that could lead to full code execution. The request can be unauthenticated in the form of GET or POST requests, and does not require the requested resource to exist on the server.

Embedthis GoAhead before 5.0.1 mishandles redirected HTTP requests with a large Host header. The GoAhead WebsRedirect uses a static host buffer that has a limited length and can overflow. This can cause a copy of the Host header to fail, leaving that buffer uninitialized, which may leak uninitialized data in a response.

An issue was discovered in Embedthis GoAhead 2.5.0. Certain pages (such as goform/login and config/log_off_page.htm) create links containing a hostname obtained from an arbitrary HTTP Host header sent by an attacker. This could potentially be used in a phishing attack.

In http.c in Embedthis GoAhead before 4.1.1 and 5.x before 5.0.1, a header parsing vulnerability causes a memory assertion, out-of-bounds memory reference, and potential DoS, as demonstrated by a colon on a line by itself.

An issue was discovered in Embedthis GoAhead before 4.0.1 and Appweb before 7.0.2. The server mishandles some HTTP request fields associated with time, which results in a NULL pointer dereference, as demonstrated by If-Modified-Since or If-Unmodified-Since with a month greater than 11.

The Embedthis HTTP library, and Appweb versions before 7.0.3, have a logic flaw related to the authCondition function in http/httpLib.c. With a forged HTTP request, it is possible to bypass authentication for the form and digest login types.

EmbedThis GoAhead Webserver version 4.0.0 is vulnerable to a NULL pointer dereference in the CGI handler resulting in memory corruption or denial of service.

EmbedThis GoAhead Webserver versions 4.0.0 and earlier is vulnerable to an integer overflow in the HTTP listener resulting in denial of service.

Embedthis GoAhead web servers before version 3.6.5 initialize the environment of forked CGI scripts using untrusted HTTP request parameters in the cgiHandler function (cgi.c), which allows an attacker to inject dynamic-loader variables such as LD_PRELOAD when CGI is enabled and the CGI program is dynamically linked. By POSTing a shared-object payload in the request body and referencing it through /proc/self/fd/0, the attacker causes the glibc dynamic linker to load and execute their code, resulting in unauthenticated remote code execution with the privileges of the web server. The attack requires no privileges or user interaction, but only works on targets with CGI enabled and a dynamically linked CGI binary, which limits the exploitable share of GoAhead's very large embedded-device footprint. Affected deployments include Embedthis GoAhead prior to 3.6.5 across embedded and IoT devices, as well as Oracle Integrated Lights Out Manager (ILOM) service processors that ship the affected GoAhead code. The flaw is confirmed exploited in the wild: CISA added it to the Known Exploited Vulnerabilities Catalog on 2021-12-10, and EPSS assigns a 96.3% probability of exploitation within 30 days.

Do: Upgrade Embedthis GoAhead to version 3.6.5 or later per vendor instructions, and apply the ILOM updates Oracle provides in its security advisories for Integrated Lights Out Manager. Where upgrading is not immediately possible, disable CGI or ensure CGI programs are statically linked so LD_PRELOAD cannot be abused, and prioritize patching internet-exposed devices. Because this vulnerability is on the CISA KEV catalog, use asset inventories and exposure scans to confirm no remaining unpatched GoAhead instances are reachable from the internet.

GoAhead 3.4.0 through 3.6.5 has a NULL Pointer Dereference in the websDecodeUrl function in http.c, leading to a crash for a "POST / HTTP/1.1" request.

A vulnerability in a custom-built GoAhead web server used on Foscam, Vstarcam, and multiple white-label IP camera models allows an attacker to craft a malformed HTTP ("GET system.ini HTTP/1.1\n\n" - note the lack of "/" in the path field of the request) request that will disclose the configuration file with the login password.