Multiple vulnerabilities in web2py Sample Web Application
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2016-3953 CVE-2016-3957 CVE-2016-3954 |
| CWE-ID | CWE-798 CWE-502 CWE-200 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. |
| Vulnerable software Subscribe |
web2py Web applications / Other software |
| Vendor | web2py |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Hardcoded credentials
EUVDB-ID: #VU18924
Risk: High
CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-3953
CWE-ID:
CWE-798 - Use of Hard-coded Credentials
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to presence of a hardcoded encryption key in the "session.connect" function call. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall update from vendor's website.
Vulnerable software versionsweb2py: 2.0.0 - 2.14.1
External linkshttp://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
http://github.com/web2py/web2py/blob/R-2.14.1/applications/examples/models/session.py
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
2) Deserialization of Untrusted Data
EUVDB-ID: #VU18926
Risk: High
CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-3957
CWE-ID:
CWE-502 - Deserialization of Untrusted Data
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to the "secure_load" function in "gluon/utils.py" uses pickle.loads to deserialize session information stored in cookies. A remote attacker with knowledge of the encryption key (see vulnerability #1) can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsweb2py: 2.0.0 - 2.14.1
External linkshttp://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
http://github.com/web2py/web2py/blob/R-2.14.1/gluon/utils.py#L200
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
3) Information disclosure
EUVDB-ID: #VU18927
Risk: Low
CVSSv3.1: 3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-3954
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the software allows access to the "session_cookie_key" value if a request is made to the "examples/simple_examples/status" page. A remote authenticated attacker can gain unauthorized access to sensitive information on the system.
MitigationInstall updates from vendor's website.
Vulnerable software versionsweb2py: 2.0.0 - 2.14.1
External linkshttp://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
