UBUNTU-CVE-2017-15710

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UBUNTU-CVE-2017-15710

Summary:

Details: In Apache httpd 2.0.23 to 2.0.65, 2.2.0 to 2.2.34, and 2.4.0 to 2.4.29, mod_authnz_ldap, if configured with AuthLDAPCharsetConfig, uses the Accept-Language header value to lookup the right charset encoding when verifying the user's credentials. If the header value is not present in the charset conversion table, a fallback mechanism is used to truncate it to a two characters value to allow a quick retry (for example, 'en-US' is truncated to 'en'). A header value of less than two characters forces an out of bound write of one NUL byte to a memory location that is not part of the string. In the worst case, quite unlikely, the process would crash which could be used as a Denial of Service attack. In the more likely case, this memory is already reserved for future use and the issue has no effect at all.

References: https://ubuntu.com/security/CVE-2017-15710, http://www.openwall.com/lists/oss-security/2018/03/24/8, https://httpd.apache.org/security/vulnerabilities_24.html, https://ubuntu.com/security/notices/USN-3627-1, https://ubuntu.com/security/notices/USN-3627-2, https://ubuntu.com/security/notices/USN-3937-2, https://www.cve.org/CVERecord?id=CVE-2017-15710