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Vulnerability of OpenSSL: buffer overflow via EVP_XUpdate

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via EVP_XUpdate of OpenSSL, in order to trigger a denial of service, and possibly to run code.
Vulnerable software: Debian, Nodejs Core, OpenSSL, openSUSE Leap, stunnel, SUSE Linux Enterprise Desktop, SLES, Ubuntu, VxWorks.
Severity of this announce: 2/4.
Creation date: 16/02/2021.
Références of this computer vulnerability: CERTFR-2021-AVI-124, CVE-2021-23840, DLA-2563-1, DLA-2565-1, DSA-4855-1, openSUSE-SU-2021:0357-1, openSUSE-SU-2021:0372-1, SUSE-SU-2021:0649-1, SUSE-SU-2021:0651-1, SUSE-SU-2021:0673-1, SUSE-SU-2021:0674-1, USN-4738-1, VIGILANCE-VUL-34597.

Description of the vulnerability 

An attacker can trigger a buffer overflow via EVP_XUpdate of OpenSSL, in order t...
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This cybersecurity alert impacts software or systems such as Debian, Nodejs Core, OpenSSL, openSUSE Leap, stunnel, SUSE Linux Enterprise Desktop, SLES, Ubuntu, VxWorks.

Our Vigil@nce team determined that the severity of this weakness is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this security weakness.

Solutions for this threat 

Solutions for this vulnerability are not yet public.
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