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CVE-2023-27538

Status Candidate

Overview

An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.

Related Files

Ubuntu Security Notice USN-5964-1
Posted Mar 21, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5964-1 - Harry Sintonen discovered that curl incorrectly handled certain TELNET connection options. Due to lack of proper input scrubbing, curl could pass on user name and telnet options to the server as provided, contrary to expectations. Harry Sintonen discovered that curl incorrectly handled special tilde characters when used with SFTP paths. A remote attacker could possibly use this issue to circumvent filtering.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2023-27533, CVE-2023-27534, CVE-2023-27535, CVE-2023-27536, CVE-2023-27538
SHA-256 | 7303af9763b09b697c1acbc39214d51f90dd82cd2f8e2e8bd2040d6a4b2ec3e8
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