CVE-2021-22901
Vulnerability from cvelistv5
Published
2021-06-11 15:49
Modified
2024-08-03 18:58
Severity ?
Summary
curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.
References
support@hackerone.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
support@hackerone.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdfThird Party Advisory
support@hackerone.comhttps://curl.se/docs/CVE-2021-22901.htmlExploit, Patch, Vendor Advisory
support@hackerone.comhttps://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479Patch, Third Party Advisory
support@hackerone.comhttps://hackerone.com/reports/1180380Exploit, Issue Tracking, Third Party Advisory
support@hackerone.comhttps://security.netapp.com/advisory/ntap-20210723-0001/Third Party Advisory
support@hackerone.comhttps://security.netapp.com/advisory/ntap-20210727-0007/Third Party Advisory
support@hackerone.comhttps://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
support@hackerone.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
support@hackerone.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
Impacted products
n/ahttps://github.com/curl/curl
Show details on NVD website

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  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.