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CVE-2023-27534

Status Candidate

Overview

A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly replaced when used as a prefix in the first path element, in addition to its intended use as the first element to indicate a path relative to the user's home directory. Attackers can exploit this flaw to bypass filtering or execute arbitrary code by crafting a path like /~2/foo while accessing a server with a specific user.

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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