Ritlabs TinyWeb Server 1.94 Request crlf injection

Summaryinfo

A vulnerability described as problematic has been identified in Ritlabs TinyWeb Server 1.94. This issue affects some unknown processing of the component Request Handler. The manipulation with the input %0D%0A results in crlf injection. This vulnerability is known as CVE-2024-5193. It is possible to launch the attack remotely. Furthermore, an exploit is available. Upgrading the affected component is recommended. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability was found in Ritlabs TinyWeb Server 1.94. It has been classified as problematic. Affected is an unknown code block of the component Request Handler. The manipulation with the input value %0D%0A leads to a crlf injection vulnerability. CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity.

The advisory is available at github.com. The advisory contains:

When TinyWeb HTTP Server processes requests that result in HTTP redirects (302 responses), the request URL path is used to construct the Location header value. Prior to version 1.99, URL-encoded CRLF sequences (%0D%0A) in the request path were URL-decoded and included directly in the response headers without sanitization.

The CRLF characters (Carriage Return \r = %0D and Line Feed \n = %0A) are HTTP header delimiters. When injected into headers, they allow attackers to terminate the current header and inject arbitrary additional headers.
This vulnerability is traded as CVE-2024-5193. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known.

The exploit is shared for download at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.

Upgrading to version 1.99 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch d49c3da6a97e950975b18626878f3ee1f082358e is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. The vulnerability will be addressed with the following lines of code:

function ReturnNewLocation(const ALocation: AnsiString; d: THTTPData)
  : TAbstractHttpResponseData;
begin
  // CVE-2024-5193: Strip CRLF to prevent HTTP header injection
  // Without this, attacker could inject headers via: GET /path%0D%0AEvil:Header
  d.ResponseResponseHeader.Location := StripCRLF(ALocation);
  Result := THttpResponseErrorCode.Create(302);
end;
The advisory contains the following remark:
Place TinyWeb behind a reverse proxy that sanitizes CRLF sequences in URLs
Use a Web Application Firewall (WAF) to block requests containing %0D or %0A
Monitor logs for suspicious requests containing encoded CRLF sequences

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Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍
Reliability: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: TinyWeb Server 1.99
Patch: d49c3da6a97e950975b18626878f3ee1f082358e
Workaround: masiutin.net

Timelineinfo

05/22/2024 🔍
05/22/2024 +0 days 🔍
01/05/2026 +592 days 🔍
01/05/2026 +0 days 🔍

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2024-5193 (🔍)
GCVE (CVE): GCVE-0-2024-5193
GCVE (VulDB): GCVE-100-265830
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/22/2024 07:17 AM
Updated: 01/05/2026 09:27 PM
Changes: 05/22/2024 07:17 AM (57), 06/23/2025 05:33 PM (32), 01/05/2026 08:04 PM (11), 01/05/2026 08:07 PM (4), 01/05/2026 09:27 PM (3)
Complete: 🔍
Submitter: Senatorhotchkiss
Committer: maximmasiutin
Cache ID: 244::40

Submitinfo

Accepted

  • Submit #333059: Ritlabs TinyWeb Server 1.94 CRLF Injection (by Senatorhotchkiss)

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Discussion

 maximmasiutin (+0)
3 months ago
Mitigated in version 1.99, see https://www.masiutin.net/tinyweb-cve-2024-5193.html

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