Multiple vulnerabilities in Apache HTTP server



Published: 2017-06-20 | Updated: 2017-07-14
Risk Medium
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2017-3167
CVE-2017-3169
CVE-2017-7668
CVE-2017-9788
CVE-2017-7679
CWE-ID CWE-592
CWE-125
CWE-200
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Public exploit code for vulnerability #5 is available.
Vulnerable software
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Apache HTTP Server
Server applications / Web servers

Vendor Apache Foundation

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Authentication bypass

EUVDB-ID: #VU7115

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3167

CWE-ID: CWE-592 - Authentication Bypass Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to usage of the ap_get_basic_auth_pw() function by third-party modules outside of the authentication phase. A remote attacker can create a specially crafted HTTP request to vulnerable web server, bypass authentication requirements and gain unauthorized access to otherwise protected information.

Mitigation

Update Apache HTTP server to version 2.2.34 or 2.4.26.

Vulnerable software versions

Apache HTTP Server: 2.2.0 - 2.4.25


CPE2.3 External links

http://httpd.apache.org/security/vulnerabilities_22.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.

2) NULL pointer dereference

EUVDB-ID: #VU7116

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-3169

CWE-ID: CWE-592 - Authentication Bypass Issues

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform denial of service attack.

The vulnerability exists due to a NULL pointer dereference error within mod_ssl module, when third-party modules call ap_hook_process_connection() function during an HTTP request to an HTTPS port. A remote attacker can send a specially crafted HTTP request and crash the affected web server.

Mitigation

Update Apache HTTP server to version 2.2.34 or 2.4.26.

Vulnerable software versions

Apache HTTP Server: 2.2.0 - 2.4.25


CPE2.3 External links

http://httpd.apache.org/security/vulnerabilities_22.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) Out-of-bound read

EUVDB-ID: #VU7117

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-2017-7668

CWE-ID: CWE-125 - Out-of-bounds Read

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to boundary error when processing token lists within ap_find_token() function. A remote unauthenticated attacker can create a specially crafted sequence of HTTP headers and refer to data past the end of the search string. 

Successful exploitation of this vulnerability results segmentation fault and web server crash.

Mitigation

Update to version 2.2.34 or 2.4.26.

Vulnerable software versions

Apache HTTP Server: 2.2.32 - 2.4.25


CPE2.3 External links

http://httpd.apache.org/security/vulnerabilities_22.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.

4) Information disclosure

EUVDB-ID: #VU7517

Risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-9788

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated attacker to obtain potentially sensitive information on the targeted system.

The weakness exists due to improper initialization of the value placeholder in [Proxy-]Authorization headers of type 'Digest' before or between successive key=value assignments by mod_auth_digest. A remote attacker can provide an initial key with no '=' assignment to cause the stale value of uninitialized pool memory used by the prior request to leak.

Successful exploitation of the vulnerability results in information disclosure.

Mitigation

Update Apache HTTP server to version 2.2.34 or 2.4.26.

Vulnerable software versions

Apache HTTP Server: 2.2.0 - 2.4.25


CPE2.3 External links

http://httpd.apache.org/security/vulnerabilities_22.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.

5) Out-of-bounds read

EUVDB-ID: #VU7119

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-7679

CWE-ID: CWE-125 - Out-of-bounds Read

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists due to out-of-bounds read within the mod_mime when constructing Content-Type response header. A remote attacker read one byte pas the end of a buffer when sending a malicious Content-Type response header.

Mitigation

Update Apache HTTP server to version 2.2.34 or 2.4.26.

Vulnerable software versions

Apache HTTP Server: 2.2.0 - 2.4.25


CPE2.3 External links

http://httpd.apache.org/security/vulnerabilities_22.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.



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