Medium severity · published Jan 20, 2022
CVE-2022-21658
Rust is a multi-paradigm, general-purpose programming language designed for performance and safety, especially safe concurrency
6.3
CVSS
1.4%
EPSS
No
On KEV
Description
Rust is a multi-paradigm, general-purpose programming language designed for performance and safety, especially safe concurrency. The Rust Security Response WG was notified that the `std::fs::remove_dir_all` standard library function is vulnerable a race condition enabling symlink following (CWE-363). An attacker could use this security issue to trick a privileged program into deleting files and directories the attacker couldn't otherwise access or delete. Rust 1.0.0 through Rust 1.58.0 is affected by this vulnerability with 1.58.1 containing a patch. Note that the following build targets don't have usable APIs to properly mitigate the attack, and are thus still vulnerable even with a patched toolchain: macOS before version 10.10 (Yosemite) and REDOX. We recommend everyone to update to Rust 1.58.1 as soon as possible, especially people developing programs expected to run in privileged contexts (including system daemons and setuid binaries), as those have the highest risk of being affected by this. Note that adding checks in your codebase before calling remove_dir_all will not mitigate the vulnerability, as they would also be vulnerable to race conditions like remove_dir_all itself. The existing mitigation is working as intended outside of race conditions.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IO
iOS · Apple
before 15.4 · source: NVD
MA
macOS · Apple
12.0.0 before 12.3 · source: NVD
FE
Fedora · Fedoraproject
34; 35 · source: NVD
RU
Rust · Rust-lang
1.0.0 through 1.58.0 · source: NVD
TV
Tvos · Apple
before 15.4 · source: NVD
WA
Watchos · Apple
before 8.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-21658
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-21658
Exploit
https://blog.rust-lang.org/2022/01/20/cve-2022-21658.html
Patch
https://github.com/rust-lang/rust/pull/93110
Patch
https://github.com/rust-lang/rust/pull/93110/commits/32ed6e599bb4722efefd78bbc9cd7ec4613cb946
Patch
https://github.com/rust-lang/rust/pull/93110/commits/406cc071d6cfdfdb678bf3d83d766851de95abaf
Patch
https://github.com/rust-lang/rust/pull/93110/commits/4f0ad1c92ca08da6e8dc17838070975762f59714
Exploit
https://github.com/rust-lang/rust/security/advisories/GHSA-r9cc-f5pr-p3j2
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