Cryptocat up to 2.0.21 Regular Expression cross site scripting

Summaryinfo

A vulnerability categorized as critical has been discovered in Cryptocat up to 2.0.21. The affected element is an unknown function of the component Regular Expression Handler. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2013-4103. The attack may be launched remotely. Furthermore, there is an exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Cryptocat up to 2.0.21. Affected is an unknown functionality of the component Regular Expression Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was shared 11/07/2012 by Mario Heiderich, Krzysztof Koktowicz and Maxim Rupp with Cure53 as confirmed bulletin (Website). The advisory is shared for download at blog.crypto.cat. The vendor cooperated in the coordination of the public release. This vulnerability is traded as CVE-2013-4103 since 06/12/2013. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

Upgrading to version 2.0.22 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (38637) and OSVDB (95007†). Further details are available at blog.crypto.cat. The entries VDB-9432, VDB-9433, VDB-9434 and VDB-9435 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Cryptocat

Version

• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3
• 2.0.4
• 2.0.5
• 2.0.6
• 2.0.7
• 2.0.8
• 2.0.9
• 2.0.10
• 2.0.11
• 2.0.12
• 2.0.13
• 2.0.14
• 2.0.15
• 2.0.16
• 2.0.17
• 2.0.18
• 2.0.19
• 2.0.20
• 2.0.21

License

• free

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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