#4643: openssl-1.1.1g (CVE-2020-1967)
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Reporter: renodr | Owner: lfs-book
Type: task | Status: new
Priority: high | Milestone: 9.2
Component: Book | Version: SVN
Severity: normal | Keywords:
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New security release
{{{
Major changes between OpenSSL 1.1.1f and OpenSSL 1.1.1g [21 Apr 2020]
Fixed segmentation fault in SSL_check_chain() (CVE-2020-1967)
}}}
'''Security Advisory'''
{{{
OpenSSL Security Advisory [21 April 2020]
=========================================
Segmentation fault in SSL_check_chain (CVE-2020-1967)
=====================================================
Severity: High
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.
Affected OpenSSL 1.1.1 users should upgrade to 1.1.1g
This issue was found by Bernd Edlinger and reported to OpenSSL on 7th
April
2020. It was found using the new static analysis pass being implemented in
GCC,
- -fanalyzer. Additional analysis was performed by Matt Caswell and
Benjamin
Kaduk.
Note
=====
This issue did not affect OpenSSL 1.0.2 however these versions are out of
support and no longer receiving public updates. Extended support is
available
for premium support customers:
https://www.openssl.org/support/contracts.html
This issue did not affect OpenSSL 1.1.0 however these versions are out of
support and no longer receiving updates.
Users of these versions should upgrade to OpenSSL 1.1.1.
References
==========
URL for this Security Advisory:
https://www.openssl.org/news/secadv/20200421.txt
Note: the online version of the advisory may be updated with additional
details
over time.
}}}
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