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CVE-2022-2520: tiffcrop: sysmalloc assertion in rotateImage() at tiffcrop.c:8621 (#424) · Issues · libtiff / libtiff · GitLab

A flaw was found in libtiff 4.4.0rc1. There is a sysmalloc assertion fail in rotateImage() at tiffcrop.c:8621 that can cause program crash when reading a crafted input.

CVE
#ubuntu#linux#git

Summary

There is a sysmalloc assertion in rotateImage() at tiffcrop.c:8621

8621: if (!(rbuff = (unsigned char *)limitMalloc(buffsize)))

Version

root@peng:~/libtiff-v4.4.0rc1# tools/.libs/tiffcrop -v
Library Release: LIBTIFF, Version 4.4.0
Copyright (c) 1988-1996 Sam Leffler
Copyright (c) 1991-1996 Silicon Graphics, Inc.
Tiffcrop version: 2.5, last updated: 02-09-2022

Steps to reproduce

./autogen.sh
./configure
make -j
root@peng:~/libtiff-v4.4.0rc1# gdb --args tools/.libs/tiffcrop -Z 1:4,3:3 -R 90 -H 300 -S 2:2 -i poc3 /tmp/foo
TIFFFillStrip: Read error on strip 20; got 18446744073708357672 bytes, expected 7304.
tiffcrop: malloc.c:2401: sysmalloc: Assertion `(old_top == initial_top (av) && old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0)' failed.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff77a17f1 in __GI_abort () at abort.c:79
#2  0x00007ffff77f4af1 in __malloc_assert (file=<optimized out>, function=<optimized out>, line=<optimized out>, assertion=<optimized out>) at malloc.c:298
#3  sysmalloc (nb=nb@entry=87680, av=av@entry=0x7ffff7b4cc40 <main_arena>) at malloc.c:2398
#4  0x00007ffff77f6060 in _int_malloc (av=av@entry=0x7ffff7b4cc40 <main_arena>, bytes=bytes@entry=87660) at malloc.c:4135
#5  0x00007ffff77f80ac in __GI___libc_malloc (bytes=87660) at malloc.c:3067
#6  0x000055555555baa6 in rotateImage (rotation=<optimized out>, image=0x7fffffff88a0, img_width=0x7fffffff8b88, img_length=0x7fffffff8b8c, ibuff_ptr=0x7fffffff88c0)
    at tiffcrop.c:8621
#7  0x00005555555568f6 in processCropSelections (read_buff_ptr=0x7fffffff8890, seg_buffs=0x7fffffff8950, crop=0x7fffffff8b50, image=0x7fffffff88a0) at tiffcrop.c:7671
#8  main (argc=<optimized out>, argv=0x7fffffffe348) at tiffcrop.c:2415

Platform

uname -a Linux peng 5.4.0-42-generic 18.04.1-Ubuntu SMP Fri Jul 10 07:21:24 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

poc3

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