Errata for the 9.1 Version of the LFS Book

Known Security Vulnerabilities

• CVE-2020-1967: Crash in OpenSSL during or after a TLS 1.3 handshake. To patch it, upgrade to OpenSSL-1.1.1g or later using the instructions from the 9.1 book with the version of OpenSSL from the development book.
• CVE-2019-18348: potential for malicious HTTP header injection if the attacker controls the url parameter followed by an HTTP header. To patch it, upgrade to Python-3.8.3 or later using the instructions from the 9.1 book with the version of Python from the development book.
• CVE-2020-8492: Inefficient regular expression in urllib can be exploited to cause a denial of service. The regex was fixed in Python-3.8.3 and prevents "catastrophic backtracking". To patch it, upgrade to Python-3.8.3 or later using the instructions from the 9.1 book with the version of Python from the development book.
• CVE-2020-10543: Buffer overflow caused by a crafted regular expression in Perl. To patch it, upgrade to Perl-5.30.3 or later using the instructions from the 9.1 book with the version of Perl from the development book.
• CVE-2020-10878: Integer overflow via malformed bytecode produced by a crafted regular expression. To patch it, upgrade to Perl-5.30.3 or later using the instructions from the 9.1 book with the version of Perl from the development book.
• CVE-2020-12723: Buffer overflow caused by a crafed regular expression. To patch it, upgrade to Perl-5.30.3 or later using the instructions from the 9.1 book with the version of Perl-5.30 from the development book.
• CVE-2019-20907: infinite loop when reading TAR files. To patch it, upgrade to Python-3.8.5 or higher using the instructions from the 9.1 book with the version of Python from the development book.

Miscellaneous Errata

• The correct number of tests for gmp-6.2.0 is 197, not 190.