CVE - CVE-2021-22901

CVE-ID
CVE-2021-22901	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf CONFIRM:https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf URL:https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf CONFIRM:https://security.netapp.com/advisory/ntap-20210723-0001/ URL:https://security.netapp.com/advisory/ntap-20210723-0001/ CONFIRM:https://security.netapp.com/advisory/ntap-20210727-0007/ URL:https://security.netapp.com/advisory/ntap-20210727-0007/ MISC:https://curl.se/docs/CVE-2021-22901.html URL:https://curl.se/docs/CVE-2021-22901.html MISC:https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 URL:https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 MISC:https://hackerone.com/reports/1180380 URL:https://hackerone.com/reports/1180380 MISC:https://www.oracle.com//security-alerts/cpujul2021.html URL:https://www.oracle.com//security-alerts/cpujul2021.html MISC:https://www.oracle.com/security-alerts/cpuapr2022.html URL:https://www.oracle.com/security-alerts/cpuapr2022.html MISC:https://www.oracle.com/security-alerts/cpujan2022.html URL:https://www.oracle.com/security-alerts/cpujan2022.html
Assigning CNA
HackerOne
Date Record Created
20210106	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210106)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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