RUSTSEC-2019-0007

Processing of maliciously crafted length fields causes memory allocation SIGABRTs

Reported

June 13, 2019

Issued

October 1, 2020 (last modified: June 13, 2023)

Package

asn1_der (crates.io)

Type

Vulnerability

Keywords

#dos

Aliases

References

https://github.com/KizzyCode/asn1_der/issues/1

CVSS Score

7.5 HIGH

CVSS Details

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Patched

>=0.6.2

Description

Affected versions of this crate tried to preallocate a vector for an arbitrary amount of bytes announced by the ASN.1-DER length field without further checks.

This allows an attacker to trigger a SIGABRT by creating length fields that announce more bytes than the allocator can provide.

The flaw was corrected by not preallocating memory.

Advisory available under CC0-1.0 license.