Date: Wed, 11 May 2022 08:41:12 +0200 (CEST) From: Daniel Stenberg <daniel@...x.se> To: curl security announcements -- curl users <curl-users@...ts.haxx.se>, curl-announce@...ts.haxx.se, libcurl hacking <curl-library@...ts.haxx.se>, oss-security@...ts.openwall.com Subject: [SECURITY ADVISORY] curl: TLS and SSH connection too eager reuse TLS and SSH connection too eager reuse ====================================== Project curl Security Advisory, May 11 2022 - [Permalink](https://curl.se/docs/CVE-2022-27782.html) VULNERABILITY ------------- libcurl would reuse a previously created connection even when a TLS or SSH related option had been changed that should have prohibited reuse. libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. However, several TLS and SSH settings were left out from the configuration match checks, making them match too easily. We are not aware of any exploit of this flaw. INFO ---- Here are the list of options that were not considered in the check, so curl would reuse a connection even if the subsequent transfer would have changed one or more of these options. ### TLS options - `CURLOPT_SSL_OPTIONS` (since 7.25.0) - `CURLOPT_CRLFILE` (since 7.19.0) - `CURLOPT_TLSAUTH_USERNAME` (since 7.21.4) - `CURLOPT_TLSAUTH_PASSWORD` (since 7.21.4) - `CURLOPT_PROXY_SSL_OPTIONS` (since 7.52.0) - `CURLOPT_PROXY_CRLFILE` (since 7.52.0) - `CURLOPT_PROXY_TLSAUTH_USERNAME` (since 7.52.0) - `CURLOPT_PROXY_TLSAUTH_PASSWORD` (since 7.52.0) ### SSH options - `CURLOPT_SSH_PUBLIC_KEYFILE` (since 7.16.1) - `CURLOPT_SSH_PRIVATE_KEYFILE` (since 7.16.1) This flaw was initially introduced in curl 7.16.1 and has been widened several times since then. See table above for details The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2022-27782 to this issue. CWE-305: Authentication Bypass by Primary Weakness Severity: Medium AFFECTED VERSIONS ----------------- - Affected versions: curl 7.16.1 to and including 7.83.0 - Not affected versions: curl < 7.16.1 and curl >= 7.83.1 libcurl is used by many applications, but not always advertised as such! THE SOLUTION ------------ The two patches for CVE-2022-27782: [TLS-fix](https://github.com/curl/curl/commit/f18af4f874) and [SSH-fix](https://github.com/curl/curl/commit/1645e9b44505abd5cbaf65da5282c3f33b5924a5) RECOMMENDATIONS -------------- A - Upgrade curl to version 7.83.1 B - Apply the patch to your local version TIMELINE -------- This issue was reported to the curl project on May 1, 2022. We contacted distros@...nwall on May 5. libcurl 7.83.1 was released on May 11 2022, coordinated with the publication of this advisory. CREDITS ------- This issue was reported by Harry Sintonen. Patched by Daniel Stenberg. Thanks a lot! -- / daniel.haxx.se | Commercial curl support up to 24x7 is available! | Private help, bug fixes, support, ports, new features | https://curl.se/support.html
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