CVE-2021-22901 is a use-after-free vulnerability in curl versions 7.75.0 through 7.76.1, affecting products from vendors like haxx, NetApp, Oracle, Siemens, and Splunk. A malicious server can exploit this flaw when a TLS 1.3 session ticket arrives over a connection, potentially leading to remote code execution in the client. This vulnerability is rated as High severity (CVSS 8.1) due to its network attack vector, high impact on confidentiality, integrity, and availability, and high attack complexity. While no public exploit code or active exploitation has been observed, the vulnerability has garnered some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 7.75.0, <= 7.76.1CPE matchmatch criteria | cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* | ||
1.11.0CPE matchmatch criteria | cpe:2.3:a:oracle:communications_cloud_native_core_binding_support_function:1.11.0:*:*:*:*:*:*:* | ||
1.10.0CPE matchmatch criteria | cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* | ||
1.15.0CPE matchmatch criteria | cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.0:*:*:*:*:*:*:* | ||
1.15.1CPE matchmatch criteria | cpe:2.3:a:oracle:communications_cloud_native_core_network_repository_function:1.15.1:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
August Third Party Package Updates in Splunk Universal Forwarder
Aug 30, 2023curl 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
Jun 8, 2021curl: Use-after-free in TLS session handling when using OpenSSL TLS backend
May 26, 2021TLS session caching disaster
May 26, 2021