Use After Free Affecting curl package, versions <7.77.0-r0
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Test your applications- Snyk ID SNYK-ALPINE316-CURL-2842536
- published 28 May 2021
- disclosed 11 Jun 2021
Introduced: 28 May 2021
CVE-2021-22901 Open this link in a new tabHow to fix?
Upgrade Alpine:3.16
curl
to version 7.77.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl
package and not the curl
package as distributed by Alpine
.
See How to fix?
for Alpine:3.16
relevant fixed versions and status.
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
- https://security.netapp.com/advisory/ntap-20210723-0001/
- https://curl.se/docs/CVE-2021-22901.html
- https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479
- https://hackerone.com/reports/1180380
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf
- https://security.netapp.com/advisory/ntap-20210727-0007/
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html