Slackware Linux update for httpd



Published: 2016-12-24
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
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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

CVSSv3.1:

CVE-ID: CVE-2016-8740

CWE-ID: CWE-401 - Improper Release of Memory Before Removing Last Reference ('Memory Leak')

Exploit availability: Yes

Description

The 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.

Mitigation

Update the affected package httpd.

Vulnerable software versions

Slackware Linux: 14.0 - 14.2


CPE2.3 External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495677

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) Httpoxy issue

EUVDB-ID: #VU337

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2016-5387

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The 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.

Mitigation

Update the affected package httpd.

Vulnerable software versions

Slackware Linux: 14.0 - 14.2


CPE2.3 External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495677

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Improper input validation

EUVDB-ID: #VU1886

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2016-2161

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The 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.

Mitigation

Update the affected package httpd.

Vulnerable software versions

Slackware Linux: 14.0 - 14.2


CPE2.3 External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495677

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

4) Padding oracle attack

EUVDB-ID: #VU1800

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2016-0736

CWE-ID: CWE-696 - Incorrect Behavior Order

Exploit availability: Yes

Description

The 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.

Mitigation

Update the affected package httpd.

Vulnerable software versions

Slackware Linux: 14.0 - 14.2


CPE2.3 External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495677

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

5) Spoofing attack

EUVDB-ID: #VU1961

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2016-8743

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

The 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.

Mitigation

Update the affected package httpd.

Vulnerable software versions

Slackware Linux: 14.0 - 14.2


CPE2.3 External links

http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495677

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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