Multiple vulnerabilities in Apache Tomcat
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2016-6817 CVE-2016-6816 CVE-2016-8735 |
| CWE-ID | CWE-119 CWE-200 CWE-20 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #2 is available. Vulnerability #3 is being exploited in the wild. |
| Vulnerable software Subscribe |
Apache Tomcat Server applications / Web servers |
| Vendor | Apache Foundation |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
Discovered vulnerabilities may allow a remote attacker to gain access to potentially sensitive data, cause denial of service and execute arbitrary code on the target system.
1) Denial of service
EUVDB-ID: #VU1185
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2016-6817
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
Description
The vulnerability allows a remote attacker to perform a DoS attack.
The vulnerability exists due to boundary error when parsing HTTP/2 headers. A remote attacker can send a specially crafted HTTP/2 header longer than available buffer and trigger infinite loop.
Successful exploitation of the vulnerability may result in denial of service.
MitigationUpdate to version 9.0.0.M13.
Vulnerable software versionsApache Tomcat: 9.0.0-M1 - 9.0.0-M11
External linkshttp://tomcat.apache.org/security-9.html
http://svn.apache.org/viewvc?view=rev&rev=1765794
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Improper input validation
EUVDB-ID: #VU1184
Risk: Low
CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2016-6816
CWE-ID:
CWE-200 - Information exposure
Exploit availability: Yes
Description
The vulnerability allows a remote attacker to manipulate HTTP responses.
The vulnerability exists due to incorrect parsing of HTTP requests. A remote attacker can send a specially crafted HTTP request containing specially crafted characters and perform XSS attacks, manipulate HTTP responses or obtain potentially sensitive data, belonging to other sessions.
Successful exploitation of the vulnerability may allow an attacker to gain access to potentially sensitive information, but requires presence of a proxy server, which does not block injected characters.
Mitigation
Apache Tomcat: 6.0.0 - 9.0.0-M11
External linkshttp://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-8.html
http://tomcat.apache.org/security-9.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
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) Remote code execution
EUVDB-ID: #VU1183
Risk: Medium
CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]
CVE-ID: CVE-2016-8735
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists within JmxRemoteLifecycleListener listener component due to usage of vulnerable Oracle code, fixed in CVE-2016-3427. A remote unauthenticated attacker with ability to connect to vulnerable listener can execute arbitrary code on the target system.
Successful exploitation of the vulnerability may allow an attacker to gain complete control over vulnerable system.
MitigationUpdate to version 6.0.48, 7.0.73, 8.0.39 or 9.0.0.M13
Vulnerable software versionsApache Tomcat: 6.0.0 - 9.0.0-M11
External linkshttp://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-8.html
http://tomcat.apache.org/security-9.html
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
Yes. This vulnerability is being exploited in the wild.
