Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2021.0597
openssl security update
18 February 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: openssl
Publisher: Debian
Operating System: Debian GNU/Linux
Impact/Access: Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23841 CVE-2021-23840 CVE-2019-1551
Reference: ESB-2020.3170
ESB-2020.1889
Original Bulletin:
http://www.debian.org/security/2021/dsa-4855
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Debian Security Advisory DSA-4855-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
February 17, 2021 https://www.debian.org/security/faq
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Package : openssl
CVE ID : CVE-2019-1551 CVE-2021-23840 CVE-2021-23841
Debian Bug : 947949
Multiple vulnerabilities have been discovered in OpenSSL, a Secure
Sockets Layer toolkit. An overflow bug in the x64_64 Montgomery squaring
procedure, an integer overflow in CipherUpdate and a NULL pointer
dereference flaw X509_issuer_and_serial_hash() were found, which could
result in denial of service.
Additional details can be found in the upstream advisories
https://www.openssl.org/news/secadv/20191206.txt and
https://www.openssl.org/news/secadv/20210216.txt .
For the stable distribution (buster), these problems have been fixed in
version 1.1.1d-0+deb10u5.
We recommend that you upgrade your openssl packages.
For the detailed security status of openssl please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/openssl
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
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