RSVG 2.40.13 / 2.42.2 – ‘.svg’ Buffer Overflow
# Exploit Title: Buffer-overflow in RSVG while converting a malformed svg # Date: 17 April 2018 # Exploit Author: Hamm3r.py # Vendor Homepage: *https://launchpad.net/ubuntu/xenial/+package/librsvg2-bin # Software Link: *https://launchpad.net/ubuntu/xenial/+package/librsvg2-bin # Version: Ubuntu: 2.40.13 (Default version that is shipped with ubuntu) and MAC 2.42.2 # Tested on: Ubuntu 16.04 and MAC 10.13.3 RSVG throws a segmentation fault when malformed SVG is submitted as input. Steps to reproduce: rsvg test.png GDB Stacktrace below: Starting program: /usr/bin/rsvg fuzzed_fdiA0xdf5OQPYsN hello.png [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. _fill_xrgb32_lerp_opaque_spans (abstract_renderer=0x7fffffffbea0, y=18219, h=1, spans=<optimized out>, num_spans=<optimized out>) at ../../../../src/cairo-image-compositor.c:2249 2249 ../../../../src/cairo-image-compositor.c: No such file or directory. (gdb) backtrace #0 0x00007ffff6fd35c0 in _fill_xrgb32_lerp_opaque_spans (abstract_renderer=0x7fffffffbea0, y=18219, h=1, spans=<optimized out>, num_spans=<optimized out>) at ../../../../src/cairo-image-compositor.c:2249 #1 0x00007ffff7017921 in _cairo_tor_scan_converter_generate (xmax=248, xmin=192, height=1, y=18219, spans=0x63e438, renderer=0x7fffffffbea0, cells=<optimized out>) at ../../../../src/cairo-tor-scan-converter.c:1643 #2 0x00007ffff7017921 in _cairo_tor_scan_converter_generate (renderer=0x7fffffffbea0, antialias=1, winding_mask=<optimized out>, converter=<optimized out>) at ../../../../src/cairo-tor-scan-converter.c:1794 #3 0x00007ffff7017921 in _cairo_tor_scan_converter_generate (converter=0x63d3b0, renderer=0x7fffffffbea0) at ../../../../src/cairo-tor-scan-converter.c:1857 #4 0x00007ffff7009c33 in composite_polygon (extents=extents@entry=0x7fffffffd780, polygon=polygon@entry=0x7fffffffd360, fill_rule=fill_rule@entry=CAIRO_FILL_RULE_WINDING, antialias=antialias@entry=CAIRO_ANTIALIAS_DEFAULT, compositor=0x7ffff72b2040 <spans>, compositor=0x7ffff72b2040 <spans>) at ../../../../src/cairo-spans-compositor.c:801 #5 0x00007ffff700a6a5 in clip_and_composite_polygon (compositor=compositor@entry=0x7ffff72b2040 <spans>, extents=extents@entry=0x7fffffffd780, polygon=polygon@entry=0x7fffffffd360, fill_rule=CAIRO_FILL_RULE_WINDING, antialias=antialias@entry=CAIRO_ANTIALIAS_DEFAULT) at ../../../../src/cairo-spans-compositor.c:967 #6 0x00007ffff700b5d3 in _cairo_spans_compositor_fill (_compositor=0x7ffff72b2040 <spans>, extents=0x7fffffffd780, path=<optimized out>, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT) at ../../../../src/cairo-spans-compositor.c:1174 #7 0x00007ffff6fc5a90 in _cairo_compositor_fill (compositor=0x7ffff72b2040 <spans>, surface=0x6399a0, op=<optimized out>, source=<optimized out>, path=0x639768, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0x0) at ../../../../src/cairo-compositor.c:203 #8 0x00007ffff6fd7127 in _cairo_image_surface_fill (abstract_surface=<optimized out>, op=<optimized out>, source=<optimized out>, path=<optimized out>, fill_rule=<optimized out>, tolerance=<optimized out>, antialias=<optimized out>, clip=0x0) at ../../../../src/cairo-image-surface.c:985 #9 0x00007ffff700e7d7 in _cairo_surface_fill (surface=0x6399a0, op=CAIRO_OPERATOR_OVER, source=0x7fffffffdb50, path=0x639768, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0x0) at ../../../../src/cairo-surface.c:2341 #10 0x00007ffff6fce14c in _cairo_gstate_fill (gstate=0x630c00, path=path@entry=0x639768) at ../../../../src/cairo-gstate.c:1317 #11 0x00007ffff6fc7279 in _cairo_default_context_fill (abstract_cr=0x639400) at ../../../../src/cairo-default-context.c:1055 #12 0x00007ffff6fc02b5 in cairo_fill (cr=0x639400) at ../../../../src/cairo.c:2205 #13 0x00007ffff7bc9e95 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 #14 0x00007ffff7bc6272 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 #15 0x00007ffff7bbd4c0 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 #16 0x00007ffff7bbd4c0 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 #17 0x00007ffff7bbd982 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 #18 0x00007ffff7bbe298 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 #19 0x00007ffff7bca9e3 in rsvg_handle_render_cairo_sub () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2 Version: $rsvg-convert --version rsvg-convert version 2.42.2 #This issue is identified by Hamm3r.py, a general purpose fuzzer! Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/44491.zip |