CVE-2022-21649

Summary

Convos is an open source multi-user chat that runs in a web browser. Characters starting with "https://" in the chat window create an <a> tag. Stored XSS vulnerability using onfocus and autofocus occurs because escaping exists for "<" or ">" but escaping for double quotes does not exist. Through this vulnerability, an attacker is capable to execute malicious scripts. Users are advised to update as soon as possible.

Affected Software

Weaknesses

• CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CVE Program Container

Additional References

• https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#Second-vulnerability
• https://github.com/convos-chat/convos/commit/86b2193de375005ba71d9dd53843562c6ac1847c
• https://www.huntr.dev/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/
• https://github.com/convos-chat/convos/security/advisories/GHSA-xmpj-xwm3-vww7

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://blog.pocas.kr/2021/12/30/2021-12-30-s-xss-convos-chat/#Second-vulnerability
• https://github.com/convos-chat/convos/commit/86b2193de375005ba71d9dd53843562c6ac1847c
• https://www.huntr.dev/bounties/4532a0ac-4e7c-4fcf-9fe3-630e132325c0/
• https://github.com/convos-chat/convos/security/advisories/GHSA-xmpj-xwm3-vww7

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