header-logo
Suggest Exploit
vendor:
libcroco
by:
qflb.wu
9,8
CVSS
CRITICAL
Denial of Service (memory allocation error) and Denial of Service (infinite loop)
400, 843
CWE
Product Name: libcroco
Affected Version From: 0.6.12
Affected Version To: 0.6.12
Patch Exists: YES
Related CWE: CVE-2017-8834, CVE-2017-8835
CPE: a:gnome:libcroco:0.6.12
Metasploit: https://www.rapid7.com/db/vulnerabilities/alpine-linux-cve-2017-8834/, https://www.rapid7.com/db/vulnerabilities/huawei-euleros-2_0_sp2-cve-2017-8834/, https://www.rapid7.com/db/vulnerabilities/huawei-euleros-2_0_sp5-cve-2017-8834/, https://www.rapid7.com/db/vulnerabilities/huawei-euleros-2_0_sp8-cve-2017-8834/, https://www.rapid7.com/db/vulnerabilities/huawei-euleros-2_0_sp3-cve-2017-8834/, https://www.rapid7.com/db/vulnerabilities/suse-cve-2017-8834/, https://www.rapid7.com/db/vulnerabilities/ubuntu-cve-2017-8834/
Other Scripts: N/A
Tags: N/A
CVSS Metrics: N/A
Nuclei References: N/A
Nuclei Metadata: N/A
Platforms Tested: Linux
2017

libcroco multiple vulnerabilities

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

Mitigation:

Upgrade to the latest version of libcroco
Source

Exploit-DB raw data:

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" && 0)) != (0)" (0x0, 0x0)
    ...
    #10 0x7fd78c2fcb4d in cr_tknzr_parse_comment /home/a/Downloads/libcroco-0.6.12/src/cr-tknzr.c:462
    #11 0x7fd78c2fcb4d in cr_tknzr_get_next_token /home/a/Downloads/libcroco-0.6.12/src/cr-tknzr.c:2218
    #12 0x7fd78c356f6e in cr_parser_try_to_skip_spaces_and_comments /home/a/Downloads/libcroco-0.6.12/src/cr-parser.c:634
    #13 0x7fd78c368a43 in cr_parser_parse_stylesheet /home/a/Downloads/libcroco-0.6.12/src/cr-parser.c:2538
    #14 0x7fd78c368a43 in cr_parser_parse /home/a/Downloads/libcroco-0.6.12/src/cr-parser.c:4381
    #15 0x480a8e in sac_parse_and_display_locations /home/a/Downloads/libcroco-0.6.12/csslint/csslint.c:960
    #16 0x480a8e in main /home/a/Downloads/libcroco-0.6.12/csslint/csslint.c:1001
    #17 0x7fd78b397f44 (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
    #18 0x47c95c in _start (/home/a/Downloads/libcroco-0.6.12/csslint/.libs/lt-csslint-0.6+0x47c95c)


    Reproducer:
    libcroco_0_6_12_memory_allocation_error.css
    CVE:
    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


Proofs of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42147.zip

Navigation

Suggest Exploit

Services By CQR