VulnerabilityModified
CVE-2020-36323
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.
HIGH 8.2EPSS 2.02%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.02%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.2 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- EPSS
- 2.02% probability · 80th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-134
- Affected
- rust-lang/rust · fedoraproject/fedora
- Source
- cve@mitre.org
References
- https://github.com/rust-lang/rust/issues/80335Patch, Third Party Advisory
- https://github.com/rust-lang/rust/pull/81728Patch, Third Party Advisory
- https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174Patch, Third Party Advisory
- https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
- https://github.com/rust-lang/rust/issues/80335Patch, Third Party Advisory
- https://github.com/rust-lang/rust/pull/81728Patch, Third Party Advisory
- https://github.com/rust-lang/rust/pull/81728#issuecomment-821549174Patch, Third Party Advisory
- https://github.com/rust-lang/rust/pull/81728#issuecomment-824904190Patch, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.