Red Hat update for Apache HTTP Server



Published: 2017-06-07 | Updated: 2022-10-06
Risk Medium
Patch available YES
Number of vulnerabilities 7
CVE-ID CVE-2016-0736
CVE-2016-2161
CVE-2016-6304
CVE-2016-7056
CVE-2016-8610
CVE-2016-8740
CVE-2016-8743
CWE-ID CWE-696
CWE-20
CWE-400
CWE-310
CWE-388
CWE-401
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #6 is available.
Vulnerable software
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Red Hat Enterprise Linux for x86_64
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 7 vulnerabilities.

1) 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

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

2) 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

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

3) Resource exhaustion

EUVDB-ID: #VU646

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2016-6304

CWE-ID: CWE-400 - Uncontrolled Resource Consumption ('Resource Exhaustion')

Exploit availability: No

Description

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

The vulnerability exists due to improper resource management in OCSP stapling implementation in OpenSSL. A remote attacker can multiple requests with a large OCSP Status Request extension and consume all available memory on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

4) Information disclosure

EUVDB-ID: #VU4133

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2016-7056

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a local user obtain potentially sensitive information.

The vulnerability exists due the OpenSSL does not properly set the BN_FLG_CONSTTIME for nonces when signing with the P-256 elliptic curve in ecdsa_sign_setup() function in crypto/ec/ecdsa_ossl.c. A local attacker can conduct a cache-timing attack and recover ECDSA P-256 private keys

Successful exploitation of this vulnerability may allow an attacker to obtain potentially sensitive information.

The vulnerability is discovered in OpenSSL 1.0.1u. Other versions may also be affected.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

5) Denial of service

EUVDB-ID: #VU1083

Risk: Low

CVSSv3.1:

CVE-ID: CVE-2016-8610

CWE-ID: CWE-388 - Error Handling

Exploit availability: No

Description

The vulnerability allows a remote unauthenticated user to exhaust memory on the target system.
The weakness is due to improper handling of certain packets by the ssl3_read_bytes() function in 'ssl/s3_pkt.c.
By sending a flood of SSL3_AL_WARNING alerts during the SSL handshake, a remote attacker can consume excessive CPU resources that may lead to OpenSSL library being unavailable.
Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

6) 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

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

7) 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

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for x86_64: 6


CPE2.3 External links

http://access.redhat.com/errata/RHSA-2017:1414

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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