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CVE-2021-22901

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2021-2472-01
Posted Jun 17, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2472-01 - This release adds the new Apache HTTP Server 2.4.37 Service Pack 8 packages that are part of the JBoss Core Services offering. This release serves as a replacement for Red Hat JBoss Core Services Pack Apache Server 2.4.37 Service Pack 7 and includes bug fixes and enhancements. Issues addressed include null pointer and use-after-free vulnerabilities.

tags | advisory, web, vulnerability
systems | linux, redhat
advisories | CVE-2020-8169, CVE-2020-8284, CVE-2020-8285, CVE-2020-8286, CVE-2021-22876, CVE-2021-22890, CVE-2021-22901, CVE-2021-31618
SHA-256 | 19735da2179172dfd4dafbdef97ffa2abdb672d9b8f5865fe7fd9e743f621ed9
Download | Favorite | View
Red Hat Security Advisory 2021-2471-01
Posted Jun 17, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2471-01 - Red Hat JBoss Core Services is a set of supplementary software for Red Hat JBoss middleware products. This software, such as Apache HTTP Server, is common to multiple JBoss middleware products, and is packaged under Red Hat JBoss Core Services to allow for faster distribution of updates, and for a more consistent update experience. This release adds the new Apache HTTP Server 2.4.37 Service Pack 8 packages that are part of the JBoss Core Services offering. This release serves as a replacement for Red Hat JBoss Core Services Pack Apache Server 2.4.37 Service Pack 7 and includes bug fixes and enhancements. Issues addressed include null pointer and use-after-free vulnerabilities.

tags | advisory, web, vulnerability
systems | linux, redhat
advisories | CVE-2020-8169, CVE-2020-8284, CVE-2020-8285, CVE-2020-8286, CVE-2021-22876, CVE-2021-22890, CVE-2021-22901, CVE-2021-31618
SHA-256 | c503b0c9787ff152a79b6411488dd21ecce7fa317d626248d8da273122c8eb96
Download | Favorite | View
Gentoo Linux Security Advisory 202105-36
Posted May 26, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202105-36 - Multiple vulnerabilities have been found in cURL, the worst of which could result in the arbitrary execution of code. Versions less than 7.77.0 are affected.

tags | advisory, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2021-22876, CVE-2021-22890, CVE-2021-22898, CVE-2021-22901
SHA-256 | 27d653e9c404fce8a51dc5b8eb56846b8d6b8bc2c806dad855056460e4cd9d0d
Download | Favorite | View
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