SB2017060704 - Red Hat update for Apache HTTP Server
Published: June 7, 2017 Updated: October 6, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 secuirty vulnerabilities.
1) Padding oracle attack (CVE-ID: CVE-2016-0736)
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.
2) Improper input validation (CVE-ID: CVE-2016-2161)
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.
3) Resource exhaustion (CVE-ID: CVE-2016-6304)
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.
4) Information disclosure (CVE-ID: CVE-2016-7056)
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.
5) Denial of service (CVE-ID: CVE-2016-8610)
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.
6) Memory leak (CVE-ID: CVE-2016-8740)
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.
7) Spoofing attack (CVE-ID: CVE-2016-8743)
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.
Remediation
Install update from vendor's website.