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CVE 2017-15710

'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.'

ClearCenter response

Short response

The 'mod_authnz_ldap' parameter specified by this vulnerability is NOT enabled by default in ClearOS. Further, this parameter is not tunable to be made available via ClearOS' Webconfig. If you have manually turned this parameter on, disable it.

Long response

The 'mod_authnz_ldap' parameter specified by this vulnerability is NOT enabled by default in ClearOS. Further, this parameter is not tunable to be made available via ClearOS' Webconfig nor does any app in the ClearOS Marketplace require that this parameter be enabled. Users of ClearOS' Webconfig or ClearOS' Web Server would have to be enabled by the user in command line. If you are using custom code that has required you to manipulate this value, please disable it.

Resolution

If you have enabled 'mod_authnz_ldap' through custom editing of ClearOS via command line, disable it.

content/en_us/announcements_cve_cve-2017-15710.txt · Last modified: 2018/09/30 22:50 by dloper

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