Slackware Linux update for httpd
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2016-8740 CVE-2016-5387 CVE-2016-2161 CVE-2016-0736 CVE-2016-8743 |
| CWE-ID | CWE-401 CWE-284 CWE-20 CWE-696 |
| 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 #4 is available. |
| Vulnerable software |
Slackware Linux Operating systems & Components / Operating system |
| Vendor | Slackware |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Memory leak
EUVDB-ID: #VU1209
Risk: Low
CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2016-8740
CWE-ID:
CWE-401 - Missing release of memory after effective lifetime
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to cause denial of service.
The vulnerability exists due to improper handling of HTTP/2 headers, when the Protocols configuration includes h2 or h2c. A remote attacker can send a specially crafted HTTP/2 request, containign CONTINUATION frames to vulnerable instance and consume all available memory resources.
Successful exploitation of the vulnerability will result in denial of service (DoS) of affected web server.
MitigationUpdate the affected package httpd.
Vulnerable software versionsSlackware Linux: 14.0 - 14.2
CPE2.3- cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.1:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.2:*:*:*:*:*:*:*
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) Httpoxy issue
EUVDB-ID: #VU337
Risk: Medium
CVSSv4.0: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]
CVE-ID: CVE-2016-5387
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to obtain potentially sensitive information and compromise vulnerable server.
The vulnerability exists due to a design error in multiple implementations of web servers. A remote unauthenticated attacker can use a specially crafted Proxy header in HTTP request to influence HTTP_PROXY environment variable and redirect application’s HTTP traffic to arbitrary proxy server.
Successful exploitation of this vulnerability may allow an attacker to gain unauthorized access to sensitive information and compromise vulnerable server.
This vulnerability is known as httppoxy.
MitigationUpdate the affected package httpd.
Vulnerable software versionsSlackware Linux: 14.0 - 14.2
CPE2.3- cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.1:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.2:*:*:*:*:*:*:*
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) Improper input validation
EUVDB-ID: #VU1886
Risk: Medium
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2016-2161
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause denial of service attack.
The vulnerability exists due to input validation error in mod_auth_digest module when parsing malicious HTTP requests. A remote attacker can send a specially crafted HTTP request to affected server and cause server crash.
Successful exploitation of the vulnerability will result in crash of each server instance.
Update the affected package httpd.
Vulnerable software versionsSlackware Linux: 14.0 - 14.2
CPE2.3- cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.1:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.2:*:*:*:*:*:*:*
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.
4) Padding oracle attack
EUVDB-ID: #VU1800
Risk: Low
CVSSv4.0: 2.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2016-0736
CWE-ID:
CWE-696 - Incorrect Behavior Order
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists due to an error in Apache mod_session_crypto implementation. A remote attacker with ability to intercept traffic can decipher potentially sensitive information or tamper with data.
Successful exploitation may allow an attacker to perform padding oracle attack against vulnerable web server and obtain potentially sensitive information.
Update the affected package httpd.
Vulnerable software versionsSlackware Linux: 14.0 - 14.2
CPE2.3- cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.1:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.2:*:*:*:*:*:*:*
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
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.
5) Spoofing attack
EUVDB-ID: #VU1961
Risk: Medium
CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2016-8743
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to insufficient sanitization of HTTP request, which contain whitespace characters. A remote attacker can send a specially crafted HTTP request, containing CR, FF, VTAB characters followed by CRLF sequence and inject arbitrary data in server response.
Successful exploitation of this vulnerability may result in content spoofing, web cache poisoning and XSS attacks.
MitigationUpdate the affected package httpd.
Vulnerable software versionsSlackware Linux: 14.0 - 14.2
CPE2.3- cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.1:*:*:*:*:*:*:*
- cpe:2.3:o:slackware:slackware_linux:14.2:*:*:*:*:*:*:*
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.
