Comment 0 for bug 1666884

http://www.openwall.com/lists/oss-security/2017/02/15/4

https://github.com/Yeraze/ytnef/pull/27/files

Upstream calls this X41-2017-002 but there will probably be CVE numbers assigned too.
https://security-tracker.debian.org/tracker/TEMP-0000000-8B3E01

Fixed in zesty. I'd like to copy the Debian stable security patches when it's released there.

Quoting from the oss-security post…

Summary and Impact
------------------
Multiple Heap Overflows, out of bound writes and reads, NULL pointer
dereferences and infinite loops have been discovered in ytnef 1.9 an
earlier.
These could be exploited by tricking a user into opening a malicious
winmail.dat file.

Product Description
-------------------
ytnef offers a library and utilities to extract the files from winmail.dat
files. winmail.dat files are send by Microsoft Outlook when forwarding files
via e-mail. The vendor was very responsive in providing a patched version.

Analysis
--------
Due to the big amount of issues found no detailed analysis is given here.
Almost all allocations were unchecked and out of bounds checks rarely
performed in the code.

In total 9 patches were generated for the following issues:

1. Null Pointer Deref / calloc return value not checked
2. Infinite Loop / DoS
3. Buffer Overflow in version field
4. Out of Bound Reads
5. Integer Overflow
6. Invalid Write and Integer Overflow
7. Out of Bounds read
8. Out of Bounds read and write
9. Directory Traversal using the filename