Bugzilla – Bug 1203433
VUL-0: CVE-2022-36113: rust1.61,rust1.62,rust1.60,rust: cargo is vulnerable to symlink attacks
Last modified: 2022-11-04 09:43:26 UTC
CVE-2022-36113 Cargo is a package manager for the rust programming language. After a package is downloaded, Cargo extracts its source code in the ~/.cargo folder on disk, making it available to the Rust projects it builds. To record when an extraction is successful, Cargo writes "ok" to the .cargo-ok file at the root of the extracted source code once it extracted all the files. It was discovered that Cargo allowed packages to contain a .cargo-ok symbolic link, which Cargo would extract. Then, when Cargo attempted to write "ok" into .cargo-ok, it would actually replace the first two bytes of the file the symlink pointed to with ok. This would allow an attacker to corrupt one file on the machine using Cargo to extract the package. Note that by design Cargo allows code execution at build time, due to build scripts and procedural macros. The vulnerabilities in this advisory allow performing a subset of the possible damage in a harder to track down way. Your dependencies must still be trusted if you want to be protected from attacks, as it's possible to perform the same attacks with build scripts and procedural macros. The vulnerability is present in all versions of Cargo. Rust 1.64, to be released on September 22nd, will include a fix for it. Since the vulnerability is just a more limited way to accomplish what a malicious build scripts or procedural macros can do, we decided not to publish Rust point releases backporting the security fix. Patch files are available for Rust 1.63.0 are available in the wg-security-response repository for people building their own toolchain. Mitigations We recommend users of alternate registries to exercise care in which package they download, by only including trusted dependencies in their projects. Please note that even with these vulnerabilities fixed, by design Cargo allows arbitrary code execution at build time thanks to build scripts and procedural macros: a malicious dependency will be able to cause damage regardless of these vulnerabilities. crates.io implemented server-side checks to reject these kinds of packages years ago, and there are no packages on crates.io exploiting these vulnerabilities. crates.io users still need to exercise care in choosing their dependencies though, as remote code execution is allowed by design there as well. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-36113 https://www.cve.org/CVERecord?id=CVE-2022-36113 https://github.com/rust-lang/cargo/commit/97b80919e404b0768ea31ae329c3b4da54bed05a https://github.com/rust-lang/cargo/security/advisories/GHSA-rfj2-q3h3-hm5j
Tracking these codestream as affected: - SUSE:SLE-15:Update/rust - SUSE:SLE-15-SP1:Update/rust - SUSE:SLE-15-SP3:Update/rust - SUSE:SLE-15-SP3:Update/rust1.60 - SUSE:SLE-15-SP3:Update/rust1.61 - SUSE:SLE-15-SP3:Update/rust1.62
I will apply these patches but both advisories make it clear that: * These are extremely low risk, and likely not even worth patching in reality. The rust project does not consider it worth backporting of their own accord. * That Cargo *already* allows arbitrary remote code execution due to build.rs files so the ability to exploit this is inconsequential next to RCE, therefore you should consider only using trusted registries and sources. I think that in the future we should more carefully consider the risks and effort when making these patching decisions, measured against impact.
SUSE-SU-2022:3451-1: An update that fixes two vulnerabilities is now available. Category: security (moderate) Bug References: 1203431,1203433 CVE References: CVE-2022-36113,CVE-2022-36114 JIRA References: Sources used: openSUSE Leap 15.4 (src): rust1.62-1.62.1-150300.7.7.1 openSUSE Leap 15.3 (src): rust1.62-1.62.1-150300.7.7.1 SUSE Linux Enterprise Module for Development Tools 15-SP4 (src): rust1.62-1.62.1-150300.7.7.1 SUSE Linux Enterprise Module for Development Tools 15-SP3 (src): rust1.62-1.62.1-150300.7.7.1 NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.
Done, closing.