ed0e1e4d44
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4.8 KiB
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# Exploit Title: Buffer-overflow in RSVG while converting a malformed svg
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# Date: 17 April 2018
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# Exploit Author: Hamm3r.py
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# Vendor Homepage: *https://launchpad.net/ubuntu/xenial/+package/librsvg2-bin
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# Software Link: *https://launchpad.net/ubuntu/xenial/+package/librsvg2-bin
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# Version: Ubuntu: 2.40.13 (Default version that is shipped with ubuntu) and MAC 2.42.2
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# Tested on: Ubuntu 16.04 and MAC 10.13.3
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RSVG throws a segmentation fault when malformed SVG is submitted as input.
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Steps to reproduce:
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rsvg test.png
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GDB Stacktrace below:
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Starting program: /usr/bin/rsvg fuzzed_fdiA0xdf5OQPYsN hello.png
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[Thread debugging using libthread_db enabled]
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Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
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Program received signal SIGSEGV, Segmentation fault.
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_fill_xrgb32_lerp_opaque_spans (abstract_renderer=0x7fffffffbea0, y=18219,
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h=1, spans=<optimized out>,
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num_spans=<optimized out>) at
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../../../../src/cairo-image-compositor.c:2249
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2249 ../../../../src/cairo-image-compositor.c: No such file or directory.
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(gdb) backtrace
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#0 0x00007ffff6fd35c0 in _fill_xrgb32_lerp_opaque_spans
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(abstract_renderer=0x7fffffffbea0, y=18219, h=1, spans=<optimized out>,
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num_spans=<optimized out>) at ../../../../src/cairo-image-compositor.c:2249
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#1 0x00007ffff7017921 in _cairo_tor_scan_converter_generate (xmax=248,
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xmin=192, height=1, y=18219, spans=0x63e438, renderer=0x7fffffffbea0,
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cells=<optimized out>)
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at ../../../../src/cairo-tor-scan-converter.c:1643
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#2 0x00007ffff7017921 in _cairo_tor_scan_converter_generate
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(renderer=0x7fffffffbea0, antialias=1, winding_mask=<optimized out>,
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converter=<optimized out>) at
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../../../../src/cairo-tor-scan-converter.c:1794
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#3 0x00007ffff7017921 in _cairo_tor_scan_converter_generate
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(converter=0x63d3b0, renderer=0x7fffffffbea0)
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at ../../../../src/cairo-tor-scan-converter.c:1857
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#4 0x00007ffff7009c33 in composite_polygon
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(extents=extents@entry=0x7fffffffd780,
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polygon=polygon@entry=0x7fffffffd360,
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fill_rule=fill_rule@entry=CAIRO_FILL_RULE_WINDING,
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antialias=antialias@entry=CAIRO_ANTIALIAS_DEFAULT,
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compositor=0x7ffff72b2040 <spans>, compositor=0x7ffff72b2040 <spans>)
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at ../../../../src/cairo-spans-compositor.c:801
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#5 0x00007ffff700a6a5 in clip_and_composite_polygon
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(compositor=compositor@entry=0x7ffff72b2040 <spans>,
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extents=extents@entry=0x7fffffffd780,
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polygon=polygon@entry=0x7fffffffd360, fill_rule=CAIRO_FILL_RULE_WINDING,
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antialias=antialias@entry=CAIRO_ANTIALIAS_DEFAULT) at
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../../../../src/cairo-spans-compositor.c:967
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#6 0x00007ffff700b5d3 in _cairo_spans_compositor_fill
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(_compositor=0x7ffff72b2040 <spans>, extents=0x7fffffffd780,
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path=<optimized out>, fill_rule=CAIRO_FILL_RULE_WINDING,
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tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT) at
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../../../../src/cairo-spans-compositor.c:1174
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#7 0x00007ffff6fc5a90 in _cairo_compositor_fill (compositor=0x7ffff72b2040
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<spans>, surface=0x6399a0, op=<optimized out>, source=<optimized out>,
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path=0x639768, fill_rule=CAIRO_FILL_RULE_WINDING,
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tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0x0)
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at ../../../../src/cairo-compositor.c:203
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#8 0x00007ffff6fd7127 in _cairo_image_surface_fill
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(abstract_surface=<optimized out>, op=<optimized out>, source=<optimized
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out>, path=<optimized out>, fill_rule=<optimized out>, tolerance=<optimized
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out>, antialias=<optimized out>, clip=0x0) at
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../../../../src/cairo-image-surface.c:985
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#9 0x00007ffff700e7d7 in _cairo_surface_fill (surface=0x6399a0,
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op=CAIRO_OPERATOR_OVER, source=0x7fffffffdb50, path=0x639768,
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fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001,
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antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0x0) at
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../../../../src/cairo-surface.c:2341
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#10 0x00007ffff6fce14c in _cairo_gstate_fill (gstate=0x630c00,
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path=path@entry=0x639768)
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at ../../../../src/cairo-gstate.c:1317
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#11 0x00007ffff6fc7279 in _cairo_default_context_fill (abstract_cr=0x639400)
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at ../../../../src/cairo-default-context.c:1055
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#12 0x00007ffff6fc02b5 in cairo_fill (cr=0x639400) at
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../../../../src/cairo.c:2205
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#13 0x00007ffff7bc9e95 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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#14 0x00007ffff7bc6272 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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#15 0x00007ffff7bbd4c0 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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#16 0x00007ffff7bbd4c0 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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#17 0x00007ffff7bbd982 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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#18 0x00007ffff7bbe298 in () at /usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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#19 0x00007ffff7bca9e3 in rsvg_handle_render_cairo_sub () at
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/usr/lib/x86_64-linux-gnu/librsvg-2.so.2
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Version:
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$rsvg-convert --version
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rsvg-convert version 2.42.2
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#This issue is identified by Hamm3r.py, a general purpose fuzzer!
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Proof of Concept:
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https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/44491.zip |