SB2017073113 - Ubuntu update for Apache HTTP Server
Published: July 31, 2017
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Authentication bypass (CVE-ID: CVE-2017-3167)
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.
2) NULL pointer dereference (CVE-ID: CVE-2017-3169)
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.
3) Out-of-bound read (CVE-ID: CVE-2017-7668)
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.
4) Out-of-bounds read (CVE-ID: CVE-2017-7679)
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.
5) 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.