ChaCha20-Poly1305 with long nonces

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Summary

CVECVE-2019-1543
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2019-03-06 21:29:00 UTC
Updated2026-11-02 18:18:26 UTC
DescriptionChaCha20-Poly1305 is an AEAD cipher, and requires a unique nonce input for every encryption operation. RFC 7539 specifies that the nonce value (IV) should be 96 bits (12 bytes). OpenSSL allows a variable nonce length and front pads the nonce with 0 bytes if it is less than 12 bytes. However it also incorrectly allows a nonce to be set of up to 16 bytes. In this case only the last 12 bytes are significant and any additional leading bytes are ignored. It is a requirement of using this cipher that nonce values are unique. Messages encrypted using a reused nonce value are susceptible to serious confidentiality and integrity attacks. If an application changes the default nonce length to be longer than 12 bytes and then makes a change to the leading bytes of the nonce expecting the new value to be a new unique nonce then such an application could inadvertently encrypt messages with a reused nonce. Additionally the ignored bytes in a long nonce are not covered by the integrity guarantee of this cipher. Any application that relies on the integrity of these ignored leading bytes of a long nonce may be further affected. Any OpenSSL internal use of this cipher, including in SSL/TLS, is safe because no such use sets such a long nonce value. However user applications that use this cipher directly and set a non-default nonce length to be longer than 12 bytes may be vulnerable. OpenSSL versions 1.1.1 and 1.1.0 are affected by this issue. Due to the limited scope of affected deployments this has been assessed as low severity and therefore we are not creating new releases at this time. Fixed in OpenSSL 1.1.1c (Affected 1.1.1-1.1.1b). Fixed in OpenSSL 1.1.0k (Affected 1.1.0-1.1.0j).

Risk And Classification

Primary CVSS: v3.0 7.4 HIGH from [email protected]

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

EPSS: 0.057010000 probability, percentile 0.930120000 (date 2026-11-02)

Problem Types: CWE-327 | CWE-330 | Nonce Reuse

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.4HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
2.0[email protected]Primary5.8AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None

AV:N/AC:M/Au:N/C:P/I:P/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openssl Openssl All All All All
Application Openssl Openssl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected Fixed in OpenSSL 1.1.1c (Affected 1.1.1-1.1.1b) Not specified
CNA OpenSSL OpenSSL affected Fixed in OpenSSL 1.1.0k (Affected 1.1.0-1.1.0j) Not specified

References

ReferenceSourceLinkTags
Bugtraq: [SECURITY] [DSA 4475-1] openssl security update af854a3a-2127-422b-91ae-364da2661108 seclists.org
[SECURITY] Fedora 30 Update: compat-openssl10-1.0.2o-7.fc30 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Security Bulletin - Policy Auditor update fixes multiple vulnerabilities in third-party libraries (CVE-2016-0718, CVE-2016-4472, CVE-2016-5300, CVE-2017-17740, CVE-2017-9287, CVE-2019-13057, CVE-2020-15719, CVE-2019-1543, CVE-2019-1547, CVE-2019-1552, CVE-2019-1563, CVE-2019-8457, CVE-2018-20506, CVE-2018-20346, CVE-2019-16168, CVE-2017-12627) af854a3a-2127-422b-91ae-364da2661108 kc.mcafee.com
git.openssl.org Git - openssl.git/commitdiff af854a3a-2127-422b-91ae-364da2661108 git.openssl.org
Oracle Critical Patch Update - July 2019 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
[SECURITY] Fedora 29 Update: compat-openssl10-1.0.2o-7.fc29 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Debian -- Security Information -- DSA-4475-1 openssl af854a3a-2127-422b-91ae-364da2661108 www.debian.org
[security-announce] openSUSE-SU-2019:1814-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
www.openssl.org/news/secadv/20190306.txt af854a3a-2127-422b-91ae-364da2661108 www.openssl.org Vendor Advisory
Oracle Critical Patch Update - October 2019 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
Oracle Critical Patch Update Advisory - April 2020 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
git.openssl.org Git - openssl.git/commitdiff af854a3a-2127-422b-91ae-364da2661108 git.openssl.org
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
git.openssl.org Git - openssl.git/commitdiff MITRE git.openssl.org
git.openssl.org Git - openssl.git/commitdiff MITRE git.openssl.org
[SECURITY] Fedora 30 Update: compat-openssl10-1.0.2o-7.fc30 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 29 Update: compat-openssl10-1.0.2o-7.fc29 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Joran Dirk Greef of Ronomon (en)

Legacy QID Mappings

  • 500182 Alpine Linux Security Update for file
  • 500492 Alpine Linux Security Update for Open Secure Sockets Layer (OpenSSL)
  • 500560 Alpine Linux Security Update for Open Secure Sockets Layer (OpenSSL)
  • 500759 Alpine Linux Security Update for openssl
  • 501159 Alpine Linux Security Update for openssl
  • 501978 Alpine Linux Security Update for Open Secure Sockets Layer3 (OpenSSL3)
  • 502897 Alpine Linux Security Update for openssl1.1-compat
  • 503921 Alpine Linux Security Update for file
  • 504251 Alpine Linux Security Update for openssl

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