UBUNTU-CVE-2020-1967

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Source
https://ubuntu.com/security/CVE-2020-1967
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-1967.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-1967
Related
Published
2020-04-21T00:00:00Z
Modified
2020-04-21T00:00:00Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

Server or client applications that call the SSLcheckchain() 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 "signaturealgorithmscert" 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).

References

Affected packages

Ubuntu:20.04:LTS / openssl

Package

Name
openssl
Purl
pkg:deb/ubuntu/openssl?arch=src?distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.1.1f-1ubuntu2

Affected versions

1.*

1.1.1c-1ubuntu4
1.1.1d-2ubuntu3
1.1.1d-2ubuntu6
1.1.1f-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "high",
    "binaries": [
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "libcrypto1.1-udeb"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "libssl-dev"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "libssl-doc"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "libssl1.1"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "libssl1.1-dbgsym"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "libssl1.1-udeb"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "openssl"
        },
        {
            "binary_version": "1.1.1f-1ubuntu2",
            "binary_name": "openssl-dbgsym"
        }
    ]
}