RUSTSEC-2022-0014

Source

https://rustsec.org/advisories/RUSTSEC-2022-0014

Import Source

https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2022-0014.json

Aliases

Published

2022-03-15T12:00:00Z

Modified

2023-12-06T01:01:49.423753Z

Details

The BN_mod_sqrt() function, which computes a modular square root, contains a bug that can cause it to loop forever for non-prime moduli.

Internally this function is used when parsing certificates that contain elliptic curve public keys in compressed form or explicit elliptic curve parameters with a base point encoded in compressed form.

It is possible to trigger the infinite loop by crafting a certificate that has invalid explicit curve parameters.

Since certificate parsing happens prior to verification of the certificate signature, any process that parses an externally supplied certificate may thus be subject to a denial of service attack. The infinite loop can also be reached when parsing crafted private keys as they can contain explicit elliptic curve parameters.

Thus vulnerable situations include:

TLS clients consuming server certificates
TLS servers consuming client certificates
Hosting providers taking certificates or private keys from customers
Certificate authorities parsing certification requests from subscribers
Anything else which parses ASN.1 elliptic curve parameters

Also any other applications that use the BN_mod_sqrt() where the attacker can control the parameter values are vulnerable to this DoS issue.

References

Affected packages

crates.io / openssl-src

Package

Name: openssl-src

Affected ranges

Type: SEMVER
Events: Introduced

0.0.0-0

Fixed

111.18.0

Introduced

300.0.0

Fixed

300.0.5

Ecosystem specific

{
    "affects": {
        "os": [],
        "functions": [],
        "arch": []
    }
}

Database specific

{
    "cvss": null,
    "informational": null,
    "categories": [
        "denial-of-service"
    ]
}