CVE-2020-36323 : In the standard library in Rust before 1.52.0, there is an optimization for join

In the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the program to crash) if the borrowed string changes after its length is checked.

Published 2021-04-14 07:15:12

Updated 2021-04-27 14:37:26

Source MITRE

View at NVD, CVE.org

Vulnerability category: Overflow

Products affected by CVE-2020-36323

Fedoraproject » Fedora » Version: 32
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 33
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Matching versions
Rust-lang » Rust
Versions before (<) 1.52.0
cpe:2.3:a:rust-lang:rust:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2020-36323

EPSS FAQ

0.11%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 26 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-36323

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.4	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:P	10.0	4.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: Partial
8.2	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H	3.9	4.2	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: High

CWE ids for CVE-2020-36323

CWE-134 Use of Externally-Controlled Format String

The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-36323

https://github.com/rust-lang/rust/pull/81728

Fixes API soundness issue in join() by Qwaz · Pull Request #81728 · rust-lang/rust · GitHub
Patch;Third Party Advisory
https://github.com/rust-lang/rust/issues/80335

API soundness issue in join() implementation of [Borrow<str>] · Issue #80335 · rust-lang/rust · GitHub
Patch;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/

[SECURITY] Fedora 33 Update: rust-1.51.0-3.fc33 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/

[SECURITY] Fedora 32 Update: rust-1.51.0-3.fc32 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url
https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174

Fixes API soundness issue in join() by Qwaz · Pull Request #81728 · rust-lang/rust · GitHub
Patch;Third Party Advisory
https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190

Fixes API soundness issue in join() by Qwaz · Pull Request #81728 · rust-lang/rust · GitHub
Patch;Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/

[SECURITY] Fedora 34 Update: rust-1.51.0-3.fc34 - package-announce - Fedora Mailing-Lists
Mailing List;Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2020-36323

Products affected by CVE-2020-36323

Exploit prediction scoring system (EPSS) score for CVE-2020-36323

CVSS scores for CVE-2020-36323

CWE ids for CVE-2020-36323

References for CVE-2020-36323