Fedora 26: FEDORA-2017-d5cf1a55ce Critical: Risk of Buffer Overflow

libtasn1 is the ASN.1 library used in GNUTLS.

This package contains the MinGW Windows cross compiled libtasn1 library.

Noteworthy changes in release 4.11 (released 2017-05-27) [stable] - Introduced

the ASN1_TIME_ENCODING_ERROR error code to indicate an invalid encoding in the

DER time fields. - Introduced flag ASN1_DECODE_FLAG_ALLOW_INCORRECT_TIME. This

flag allows decoding errors in time fields even when in strict DER mode.

That is introduced in order to allow toleration of invalid times in X.509

certificates (which are common) even though strict DER adherence is enforced

in other fields. - Added safety check in asn1_find_node(). That prevents a crash

when a very long variable name is provided by the developer. Note that this to

be exploited requires controlling the ASN.1 definitions used by the developer,

i.e., the 'name' parameter of asn1_write_value() or asn1_read_value(). The

library is not designed to protect against malicious manipulation of the

developer assigned variable names. Reported by Jakub Jirasek. Noteworthy

changes in release 4.10 (released 2017-01-16) [stable] - Updated gnulib -Removed -Werror from default compiler flags - Fixed undefined behavior when

negating integers in _asn1_ltostr(). Issue found by oss-fuzz project (via

gnutls): https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=388 - Pass the

correct length to _asn1_get_indefinite_length_string in asn1_get_length_ber.

This addresses reading 1-byte past the end of data. Issue found by oss-fuzz

project (via gnutls): https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=330 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=331

[ 1 ] Bug #1456764 - CVE-2017-6891 mingw-libtasn1: libtasn1: Stack-based buffer overflow in asn1_find_node() [fedora-all]

https://bugzilla.redhat.com/show_bug.cgi?id=1456764

su -c 'dnf upgrade mingw-libtasn1' at the command line.

For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

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