CVE-2020-36323

rust: optimization for joining strings can cause uninitialized bytes to be exposed

Severity Score

8.2

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

En la biblioteca standard en Rust versiones anteriores a 1.52.0, se presenta una optimización para unir cadenas que pueden causar que los bytes no inicializados queden expuestos (o que el programa se bloquee) si la cadena prestada cambia después de que su longitud es comprobada

Rust Toolset provides the Rust programming language compiler rustc, the cargo build tool and dependency manager, the cargo-vendor plugin, and required libraries. Issues addressed include buffer overflow, double free, and integer overflow vulnerabilities.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-14 CVE Reserved
2021-04-14 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-134: Use of Externally-Controlled Format String

CAPEC

References (9)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/rust-lang/rust/issues/80335	2023-11-07
https://github.com/rust-lang/rust/pull/81728	2023-11-07
https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174	2023-11-07
https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-36323	2021-08-10
https://bugzilla.redhat.com/show_bug.cgi?id=1950396	2021-08-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Rust-lang Search vendor "Rust-lang"		Rust Search vendor "Rust-lang" for product "Rust"				< 1.52.0 Search vendor "Rust-lang" for product "Rust" and version " < 1.52.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected