CVE-2020-1967 — NULL Pointer Dereference in Openssl

CWE-476 — NULL Pointer Dereference16 documents9 sources
Severity
7.5HIGHNVD
EPSS
67.3%
top 1.43%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
19
OpensslJdedwards EnterpriseoneTenable LOG Correlation Engine+16 more
Timeline
PublishedApr 21
Latest updateOct 15

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…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages18 packages

▶Debianopenssl/openssl< 1.1.1g-1+3
▶NVDopenssl/openssl1.1.1d — 1.1.1f
▶CVEListV5openssl/opensslFixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f)
▶NVDoracle/http_server12.2.1.4.0

Also affects: Freebsd 12.1, Debian Linux 10.0, 9.0, Fedora 30, 31, 32

Patches

Patch: security.freebsd.org ↗Patch: www.oracle.com ↗Patch: www.oracle.com ↗

🔴Vulnerability Details

5
OSV
Null pointer deference in openssl-src↗2021-08-25
▶
GHSA
Null pointer deference in openssl-src↗2021-08-25
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OSV
Crash causing Denial of Service attack↗2020-04-25
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CVEList
Segmentation fault in SSL_check_chain↗2020-04-21
▶
OSV
CVE-2020-1967: Server or client applications that call the SSL_check_chain() function during or after a TLS 1↗2020-04-21
▶

📋Vendor Advisories

8
Oracle
Oracle Oracle PeopleSoft Risk Matrix: DPK (OpenSSL) — CVE-2020-1967↗2021-10-15
▶
Oracle
Oracle Oracle E-Business Suite Risk Matrix: Technology Stack (OpenSSL) — CVE-2020-1967↗2021-04-15
▶
Oracle
Oracle Oracle JD Edwards Risk Matrix: Enterprise Infrastructure SEC (OpenSSL) — CVE-2020-1967↗2021-01-15
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Oracle
Oracle Oracle Enterprise Manager Risk Matrix: Privilege Management (OpenSSL) — CVE-2020-1967↗2020-10-15
▶
Oracle
Oracle Oracle MySQL Risk Matrix: Connector/C++ (OpenSSL) — CVE-2020-1967↗2020-07-15
▶

💬Community

2
Bugzilla
CVE-2020-1967 openssl: Segmentation fault in SSL_check_chain causes denial of service [fedora-all]↗2020-04-21
▶
Bugzilla
CVE-2020-1967 openssl: Segmentation fault in SSL_check_chain causes denial of service↗2020-04-14
▶
CVE-2020-1967 — NULL Pointer Dereference in Openssl | cvebase