Lynx up to 2.8.8pre.4/2.8.9dev.8/2.8.9dev.9 URL Hostname privileges management

CVSS Meta Temp Score
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CTI Interest Score
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6.9$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Lynx up to 2.8.8pre.4/2.8.9dev.8/2.8.9dev.9. This impacts an unknown function of the component URL Handler. Performing a manipulation of the argument Hostname with the input www.example.com? results in privileges management. Moreover, an exploit is present.

Detailsinfo

A vulnerability classified as critical has been found in Lynx up to 2.8.8pre.4/2.8.9dev.8/2.8.9dev.9 (Web Browser). This affects some unknown processing of the component URL Handler. The manipulation of the argument hostname with the input value www.example.com? leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was disclosed 11/03/2016 by redrain root as [oss-security] CVE request:Lynx invalid URL parsing with '?' as confirmed mailinglist post (Full-Disclosure). It is possible to read the advisory at seclists.org. The vendor was not involved in the public release. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK. The advisory points out:

Lynx doesn't parse the authority component of the URL correctly when the host name part ends with '?', and could instead be tricked into connecting to a different host.

A public exploit has been developed by redrain root in URL and been published immediately after the advisory. The exploit is shared for download at seclists.org. It is declared as proof-of-concept. The code used by the exploit is:

http://[email protected]/

The mailinglist post contains the following remark:

follow the RFC and check for domains before send request

Further details are available at seclists.org. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.9

VulDB Base Score: 7.3
VulDB Temp Score: 6.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: redrain root
Programming Language: 🔍
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

11/03/2016 🔍
11/03/2016 +0 days 🔍
11/04/2016 +1 days 🔍
05/24/2019 +931 days 🔍

Sourcesinfo

Advisory: [oss-security] CVE request:Lynx invalid URL parsing with '?'
Researcher: redrain root
Status: Confirmed

GCVE (VulDB): GCVE-100-93267
scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍

Entryinfo

Created: 11/04/2016 22:17
Updated: 05/24/2019 18:55
Changes: 11/04/2016 22:17 (52), 05/24/2019 18:55 (2)
Complete: 🔍
Cache ID: 216::103

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