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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-22901 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf CVE, HackerOne Patch  Third Party Advisory 
https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf CVE, HackerOne Third Party Advisory 
https://curl.se/docs/CVE-2021-22901.html CVE, HackerOne Exploit  Patch  Vendor Advisory 
https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479 CVE, HackerOne Patch  Third Party Advisory 
https://hackerone.com/reports/1180380 CVE, HackerOne Exploit  Issue Tracking  Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210723-0001/ CVE, HackerOne Third Party Advisory 
https://security.netapp.com/advisory/ntap-20210727-0007/ CVE, HackerOne Third Party Advisory 
https://www.oracle.com//security-alerts/cpujul2021.html CVE, HackerOne Patch  Third Party Advisory 
https://www.oracle.com/security-alerts/cpuapr2022.html CVE, HackerOne Patch  Third Party Advisory 
https://www.oracle.com/security-alerts/cpujan2022.html CVE, HackerOne Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST   HackerOne  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

14 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-22901
NVD Published Date:
06/11/2021
NVD Last Modified:
11/21/2024
Source:
HackerOne