TIFFWriteScanline in tif_write.c in LibTIFF 3.8.2 has a heap-based buffer over-read, as demonstrated by bmp2tiff.

References

• advisory http://www.securityfocus.com/bid/104089
• advisory https://access.redhat.com/errata/RHSA-2019:2053
• advisory https://usn.ubuntu.com/3906-1/
• report http://bugzilla.maptools.org/show_bug.cgi?id=2788
• web https://usn.ubuntu.com/3906-2/