High severity · published Apr 21, 2020
CVE-2020-1967
Segmentation fault in SSL_check_chain
7.5
CVSS
53.3%
EPSS
No
On KEV
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. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)53.3% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MY
MySQL · Oracle
through 5.6.48; 5.7.0 through 5.7.30; 8.0.0 through 8.0.20 · source: NVD
OP
OpenSSL · OpenSSL
Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f) · source: vendor, NVD
AI
Active IQ Unified Manager · Netapp
7.3 and later; 9.5 and later · source: NVD
AS
Application Server · Oracle
12.1.3 · source: NVD
DL
Debian Linux · Debian
9.0; 10.0 · source: NVD
EP
E-series Performance Analyzer · Netapp
All versions, or not specified · source: NVD
EM
Enterprise Manager Base Platform · Oracle
13.4.0.0 · source: NVD
EM
Enterprise Manager For Storage Management · Oracle
13.3.0.0; 13.4.0.0 · source: NVD
EM
Enterprise Manager Ops Center · Oracle
12.4.0 · source: NVD
EN
Enterpriseone · Jdedwards
before 9.2.5.0 · source: NVD
FO
Fabric Operating System · Broadcom
All versions, or not specified · source: NVD
FE
Fedora · Fedoraproject
30; 31; 32 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1967
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-1967
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html
Mailing List
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html
Third Party Advisory
http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html
Mailing List
http://seclists.org/fulldisclosure/2020/May/5
Mailing List
http://www.openwall.com/lists/oss-security/2020/04/22/2
git.openssl.org
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1
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