Re: Re: [FD] libcroco multiple vulnerabilities

                							

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Re: Re: [FD] libcroco multiple vulnerabilities

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From: Alan Coopersmith &lt;alan.coopersmith () oracle com&gt;

Date: Thu, 13 Aug 2020 10:57:34 -0700

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Upstream closed these bugs as WONTFIX today since they have ended
maintenance of the standalone libcroco, as discussed in the comments on
https://gitlab.gnome.org/Archive/libcroco/-/issues/8
(which is a different security fix, for CVE-2020-12825).

        -Alan Coopersmith-               alan.coopersmith () oracle com
         Oracle Solaris Engineering - https://blogs.oracle.com/alanc

On 6/8/17 10:00 AM, Alan Coopersmith wrote:
These appear to be reported to the maintainers as:

https://bugzilla.gnome.org/show_bug.cgi?id=782647
https://bugzilla.gnome.org/show_bug.cgi?id=782649

Please include info about the upstream bugs when possible as it helps others
track when fixes are available.

 &nbsp;&nbsp;&nbsp;&nbsp;-Alan Coopersmith-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alan.coopersmith () oracle com
 &nbsp;&nbsp;&nbsp;&nbsp; Oracle Solaris Engineering - https://blogs.oracle.com/alanc

On 06/ 6/17 08:35 PM, qflb.wu wrote:
libcroco multiple vulnerabilities
================
Author : qflb.wu
===============

Introduction:
=============
Libcroco is a standalone css2 parsing and manipulation library.
The parser provides a low level event driven SAC like api and a css object 
model like api.
Libcroco provides a CSS2 selection engine and an experimental xml/css 
rendering engine.

Affected version:
=====
0.6.12

Vulnerability Description:
==========================
1.
the cr_tknzr_parse_comment function in cr-tknzr.c in libcroco 0.6.12 can cause 
a denial of service (memory allocation error) via a crafted CSS file.

./csslint-0.6 --dump-location libcroco_0_6_12_memory_allocation_error.css

==21841==ERROR: AddressSanitizer failed to allocate 0x20002000 (536879104) 
bytes of LargeMmapAllocator: 12
...
==21841==AddressSanitizer CHECK failed: 
/build/buildd/llvm-toolchain-3.4-3.4/projects/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc:68 
"(("unable to mmap" &amp;&amp; 0)) != (0)" (0x0, 0x0)
&nbsp;&nbsp;&nbsp;&nbsp; ...
&nbsp;&nbsp;&nbsp;&nbsp; #10 0x7fd78c2fcb4d in cr_tknzr_parse_comment 
/home/a/Downloads/libcroco-0.6.12/src/cr-tknzr.c:462
&nbsp;&nbsp;&nbsp;&nbsp; #11 0x7fd78c2fcb4d in cr_tknzr_get_next_token 
/home/a/Downloads/libcroco-0.6.12/src/cr-tknzr.c:2218
&nbsp;&nbsp;&nbsp;&nbsp; #12 0x7fd78c356f6e in cr_parser_try_to_skip_spaces_and_comments 
/home/a/Downloads/libcroco-0.6.12/src/cr-parser.c:634
&nbsp;&nbsp;&nbsp;&nbsp; #13 0x7fd78c368a43 in cr_parser_parse_stylesheet 
/home/a/Downloads/libcroco-0.6.12/src/cr-parser.c:2538
&nbsp;&nbsp;&nbsp;&nbsp; #14 0x7fd78c368a43 in cr_parser_parse 
/home/a/Downloads/libcroco-0.6.12/src/cr-parser.c:4381
&nbsp;&nbsp;&nbsp;&nbsp; #15 0x480a8e in sac_parse_and_display_locations 
/home/a/Downloads/libcroco-0.6.12/csslint/csslint.c:960
&nbsp;&nbsp;&nbsp;&nbsp; #16 0x480a8e in main 
/home/a/Downloads/libcroco-0.6.12/csslint/csslint.c:1001
&nbsp;&nbsp;&nbsp;&nbsp; #17 0x7fd78b397f44 (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
&nbsp;&nbsp;&nbsp;&nbsp; #18 0x47c95c in _start 
(/home/a/Downloads/libcroco-0.6.12/csslint/.libs/lt-csslint-0.6+0x47c95c)

&nbsp;&nbsp;&nbsp;&nbsp; Reproducer:
&nbsp;&nbsp;&nbsp;&nbsp; libcroco_0_6_12_memory_allocation_error.css
&nbsp;&nbsp;&nbsp;&nbsp; CVE:
&nbsp;&nbsp;&nbsp;&nbsp; CVE-2017-8834

2.
The cr_parser_parse_selector_core function in cr-parser.c in libcroco 0.6.12 
can cause a denial of service(infinite loop and CPU consumption) via a crafted 
CSS file.

./csslint-0.6 --dump-location libcroco_0_6_12_infinite_loop.css

Reproducer:
libcroco_0_6_12_infinite_loop.css
CVE:
CVE-2017-8871

===============================

qflb.wu () dbappsecurity com cn

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Re: Re: [FD] libcroco multiple vulnerabilities Alan Coopersmith (Aug 13)

Re: Re: [FD] libcroco multiple vulnerabilities Alan Coopersmith (Sep 08)

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