RUSTSEC-2020-0015

Crash causing Denial of Service attack

Reported

April 25, 2020

Issued

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

Package

openssl-src (crates.io)

Type

Vulnerability

Categories

denial-of-service

Aliases

References

https://www.openssl.org/news/secadv/20200421.txt

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

Patched

>=111.9

Unaffected

<111.6

Description

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack.

Advisory available under CC0-1.0 license.