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Vulnerability Details : CVE-2019-1543

ChaCha20-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).
Publish Date : 2019-03-06 Last Update Date : 2019-06-03
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- CVSS Scores & Vulnerability Types

CVSS Score
5.8
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 310

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2019:3700: openssl security, bug fix, and enhancement update (Low) oval:com.redhat.rhsa:def:20193700 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2019-1543

# Product Type Vendor Product Version Update Edition Language
1 Application Openssl Openssl 1.1.0g Version Details Vulnerabilities
2 Application Openssl Openssl 1.1.0b Version Details Vulnerabilities
3 Application Openssl Openssl 1.1.0 Pre3 Version Details Vulnerabilities
4 Application Openssl Openssl 1.1.0h Version Details Vulnerabilities
5 Application Openssl Openssl 1.1.0c Version Details Vulnerabilities
6 Application Openssl Openssl 1.1.0 Pre4 Version Details Vulnerabilities
7 Application Openssl Openssl 1.1.0i Version Details Vulnerabilities
8 Application Openssl Openssl 1.1.0 Version Details Vulnerabilities
9 Application Openssl Openssl 1.1.0d Version Details Vulnerabilities
10 Application Openssl Openssl 1.1.0 Pre5 Version Details Vulnerabilities
11 Application Openssl Openssl 1.1.0j Version Details Vulnerabilities
12 Application Openssl Openssl 1.1.0 - Version Details Vulnerabilities
13 Application Openssl Openssl 1.1.0e Version Details Vulnerabilities
14 Application Openssl Openssl 1.1.0 Pre6 Version Details Vulnerabilities
15 Application Openssl Openssl 1.1.0 Pre1 Version Details Vulnerabilities
16 Application Openssl Openssl 1.1.0f Version Details Vulnerabilities
17 Application Openssl Openssl 1.1.0a Version Details Vulnerabilities
18 Application Openssl Openssl 1.1.0 Pre2 Version Details Vulnerabilities
19 Application Openssl Openssl 1.1.1 Pre7 Version Details Vulnerabilities
20 Application Openssl Openssl 1.1.1 Pre2 Version Details Vulnerabilities
21 Application Openssl Openssl 1.1.1 Pre8 Version Details Vulnerabilities
22 Application Openssl Openssl 1.1.1 Pre3 Version Details Vulnerabilities
23 Application Openssl Openssl 1.1.1 Pre9 Version Details Vulnerabilities
24 Application Openssl Openssl 1.1.1 Pre4 Version Details Vulnerabilities
25 Application Openssl Openssl 1.1.1a Version Details Vulnerabilities
26 Application Openssl Openssl 1.1.1 Pre5 Version Details Vulnerabilities
27 Application Openssl Openssl 1.1.1 Version Details Vulnerabilities
28 Application Openssl Openssl 1.1.1b Version Details Vulnerabilities
29 Application Openssl Openssl 1.1.1 Pre6 Version Details Vulnerabilities
30 Application Openssl Openssl 1.1.1 Pre1 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Openssl Openssl 30

- References For CVE-2019-1543

https://www.openssl.org/news/secadv/20190306.txt CONFIRM
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=f426625b6ae9a7831010750490a5f0ad689c5ba3 CONFIRM
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=ee22257b1418438ebaf54df98af4e24f494d1809 CONFIRM

- Metasploit Modules Related To CVE-2019-1543

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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