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Ubuntu Security Notice USN-6275-1

Ubuntu Security Notice 6275-1 - Addison Crump discovered that Cargo incorrectly set file permissions on UNIX-like systems when extracting crate archives. If the crate would contain files writable by any user, a local attacker could possibly use this issue to execute code as another user.

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Ubuntu Security Notice USN-6275-1
August 03, 2023

cargo, rust-cargo vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 22.04 LTS (Available with Ubuntu Pro)
  • Ubuntu 20.04 LTS (Available with Ubuntu Pro)
  • Ubuntu 18.04 LTS (Available with Ubuntu Pro)
  • Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Cargo could be made to run programs as your login if it
installed a specially crafted crate.

Software Description:

  • cargo: Rust package manager
  • rust-cargo: Rust package manager - feature “openssl”

Details:

Addison Crump discovered that Cargo incorrectly set file permissions
on UNIX-like systems when extracting crate archives. If the crate would
contain files writable by any user, a local attacker could possibly use
this issue to execute code as another user.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS (Available with Ubuntu Pro):
cargo 0.67.1+ds0ubuntu0.libgit2-0ubuntu0.22.04.2+esm1
librust-cargo+openssl-dev 0.57.0-1ubuntu0.1~esm1
librust-cargo-dev 0.57.0-1ubuntu0.1~esm1

Ubuntu 20.04 LTS (Available with Ubuntu Pro):
cargo 0.67.1+ds0ubuntu0.libgit2-0ubuntu0.20.04.2+esm1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
cargo 0.66.0+ds0ubuntu0.libgit2-0ubuntu0.18.04.1~esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
cargo 0.47.0-1~exp1ubuntu1~16.04.1+esm1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6275-1
CVE-2023-38497

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CVE-2023-38497: Fix CVE-2023-38497 for master by pietroalbini · Pull Request #12443 · rust-lang/cargo

Cargo downloads the Rust project’s dependencies and compiles the project. Cargo prior to version 0.72.2, bundled with Rust prior to version 1.71.1, did not respect the umask when extracting crate archives on UNIX-like systems. If the user downloaded a crate containing files writeable by any local user, another local user could exploit this to change the source code compiled and executed by the current user. To prevent existing cached extractions from being exploitable, the Cargo binary version 0.72.2 included in Rust 1.71.1 or later will purge caches generated by older Cargo versions automatically. As a workaround, configure one's system to prevent other local users from accessing the Cargo directory, usually located in `~/.cargo`.

GHSA-j3xp-wfr4-hx87: Cargo not respecting umask when extracting crate archives

The Rust Security Response WG was notified that Cargo did not respect the umask when extracting crate archives on UNIX-like systems. If the user downloaded a crate containing files writeable by any local user, another local user could exploit this to change the source code compiled and executed by the current user. This vulnerability has been assigned CVE-2023-38497. ## Overview In UNIX-like systems, each file has three sets of permissions: for the user owning the file, for the group owning the file, and for all other local users. The "[umask][1]" is configured on most systems to limit those permissions during file creation, removing dangerous ones. For example, the default umask on macOS and most Linux distributions only allow the user owning a file to write to it, preventing the group owning it or other local users from doing the same. When a dependency is downloaded by Cargo, its source code has to be extracted on disk to allow the Rust compiler to read as part of the build. To ...

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