A Denial Of Service vulnerability in the apollo_upload_server Ruby gem in GitLab CE/EE version 11.11 and above allows an attacker to deny access to all users via specially crafted requests to the apollo_upload_server middleware.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-39880
• https://hackerone.com/reports/1181284
• https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39880.json
• https://gitlab.com/gitlab-org/gitlab/-/issues/330561
• jetruby/apollo_upload_server-ruby#44
• jetruby/apollo_upload_server-ruby@b0582c1
• https://github.com/jetruby/apollo_upload_server-ruby/releases/tag/2.1.0
• https://gitlab.com/gitlab-org/gitlab/-/issues/330561#note_642879964
• https://vuldb.com/?id.183842
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/apollo_upload_server/CVE-2021-39880.yml