1. Home
  2. Security Advisories
  3. OpenSSL
  4. SECADV-20220315-1

[SECADV-20220315-1] Infinite loop in BN_mod_sqrt() reachable when parsing certificates

Severity High
Affected Packages 45
Fixed Packages 3
CVEs 1
Info Packages Vulnerabilities

Infinite loop

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.

In the OpenSSL 1.0.2 version the public key is not parsed during initial
parsing of the certificate which makes it slightly harder to trigger
the infinite loop. However any operation which requires the public key
from the certificate will trigger the infinite loop. In particular the
attacker can use a self-signed certificate to trigger the loop during
verification of the certificate signature.

This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0. It was
addressed in the releases of 1.1.1n and 3.0.2 on the 15th March 2022.

Package Affected Version
pkg:openssl/openssl = 3.0.0
pkg:openssl/openssl = 3.0.1
pkg:openssl/openssl = 1.1.1
pkg:openssl/openssl = 1.1.1a
pkg:openssl/openssl = 1.1.1b
pkg:openssl/openssl = 1.1.1c
pkg:openssl/openssl = 1.1.1d
pkg:openssl/openssl = 1.1.1e
pkg:openssl/openssl = 1.1.1f
pkg:openssl/openssl = 1.1.1g
pkg:openssl/openssl = 1.1.1h
pkg:openssl/openssl = 1.1.1i
pkg:openssl/openssl = 1.1.1j
pkg:openssl/openssl = 1.1.1k
pkg:openssl/openssl = 1.1.1l
pkg:openssl/openssl = 1.1.1m
pkg:openssl/openssl = 1.0.2
pkg:openssl/openssl = 1.0.2a
pkg:openssl/openssl = 1.0.2b
pkg:openssl/openssl = 1.0.2c
pkg:openssl/openssl = 1.0.2d
pkg:openssl/openssl = 1.0.2e
pkg:openssl/openssl = 1.0.2f
pkg:openssl/openssl = 1.0.2g
pkg:openssl/openssl = 1.0.2h
pkg:openssl/openssl = 1.0.2i
pkg:openssl/openssl = 1.0.2j
pkg:openssl/openssl = 1.0.2k
pkg:openssl/openssl = 1.0.2l
pkg:openssl/openssl = 1.0.2m
pkg:openssl/openssl = 1.0.2n
pkg:openssl/openssl = 1.0.2o
pkg:openssl/openssl = 1.0.2p
pkg:openssl/openssl = 1.0.2q
pkg:openssl/openssl = 1.0.2r
pkg:openssl/openssl = 1.0.2s
pkg:openssl/openssl = 1.0.2t
pkg:openssl/openssl = 1.0.2u
pkg:openssl/openssl = 1.0.2v
pkg:openssl/openssl = 1.0.2w
pkg:openssl/openssl = 1.0.2x
pkg:openssl/openssl = 1.0.2y
pkg:openssl/openssl = 1.0.2za
pkg:openssl/openssl = 1.0.2zb
pkg:openssl/openssl = 1.0.2zc
Package Fixed Version
pkg:openssl/openssl = 3.0.2
pkg:openssl/openssl = 1.1.1n
pkg:openssl/openssl = 1.0.2zd
ID
SECADV-20220315-1
Severity
high
Impact
Infinite loop
URL
https://www.openssl.org/news/secadv/20220315.txt
Published
2022-03-15T00:00:00
(2 years ago)
Modified
2022-03-15T00:00:00
(2 years ago)
Rights
The OpenSSL Project
Other Advisories
Type Package URL Namespace Name / Product Version Distribution / Platform Arch Patch / Fix
Fixed pkg:openssl/openssl openssl = 3.0.2
Fixed pkg:openssl/openssl openssl = 1.1.1n
Fixed pkg:openssl/openssl openssl = 1.0.2zd
Affected pkg:openssl/openssl openssl = 3.0.0
Affected pkg:openssl/openssl openssl = 3.0.1
Affected pkg:openssl/openssl openssl = 1.1.1
Affected pkg:openssl/openssl openssl = 1.1.1a
Affected pkg:openssl/openssl openssl = 1.1.1b
Affected pkg:openssl/openssl openssl = 1.1.1c
Affected pkg:openssl/openssl openssl = 1.1.1d
Affected pkg:openssl/openssl openssl = 1.1.1e
Affected pkg:openssl/openssl openssl = 1.1.1f
Affected pkg:openssl/openssl openssl = 1.1.1g
Affected pkg:openssl/openssl openssl = 1.1.1h
Affected pkg:openssl/openssl openssl = 1.1.1i
Affected pkg:openssl/openssl openssl = 1.1.1j
Affected pkg:openssl/openssl openssl = 1.1.1k
Affected pkg:openssl/openssl openssl = 1.1.1l
Affected pkg:openssl/openssl openssl = 1.1.1m
Affected pkg:openssl/openssl openssl = 1.0.2
Affected pkg:openssl/openssl openssl = 1.0.2a
Affected pkg:openssl/openssl openssl = 1.0.2b
Affected pkg:openssl/openssl openssl = 1.0.2c
Affected pkg:openssl/openssl openssl = 1.0.2d
Affected pkg:openssl/openssl openssl = 1.0.2e
Affected pkg:openssl/openssl openssl = 1.0.2f
Affected pkg:openssl/openssl openssl = 1.0.2g
Affected pkg:openssl/openssl openssl = 1.0.2h
Affected pkg:openssl/openssl openssl = 1.0.2i
Affected pkg:openssl/openssl openssl = 1.0.2j
Affected pkg:openssl/openssl openssl = 1.0.2k
Affected pkg:openssl/openssl openssl = 1.0.2l
Affected pkg:openssl/openssl openssl = 1.0.2m
Affected pkg:openssl/openssl openssl = 1.0.2n
Affected pkg:openssl/openssl openssl = 1.0.2o
Affected pkg:openssl/openssl openssl = 1.0.2p
Affected pkg:openssl/openssl openssl = 1.0.2q
Affected pkg:openssl/openssl openssl = 1.0.2r
Affected pkg:openssl/openssl openssl = 1.0.2s
Affected pkg:openssl/openssl openssl = 1.0.2t
Affected pkg:openssl/openssl openssl = 1.0.2u
Affected pkg:openssl/openssl openssl = 1.0.2v
Affected pkg:openssl/openssl openssl = 1.0.2w
Affected pkg:openssl/openssl openssl = 1.0.2x
Affected pkg:openssl/openssl openssl = 1.0.2y
Affected pkg:openssl/openssl openssl = 1.0.2za
Affected pkg:openssl/openssl openssl = 1.0.2zb
Affected pkg:openssl/openssl openssl = 1.0.2zc
# CVE Description CVSS EPSS EPSS Trend (30 days) Affected Products Weaknesses Security Advisories Exploits PoC Pubblication Date Modification Date
# CVE Description CVSS EPSS EPSS Trend (30 days) Affected Products Weaknesses Security Advisories PoC Pubblication Date Modification Date