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CVE-2017-15710

Published: 26 March 2018

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.

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
upstream
Released (2.4.30)
trusty
Released (2.4.7-1ubuntu4.20)
xenial
Released (2.4.18-2ubuntu3.8)
artful
Released (2.4.27-2ubuntu4.1)
bionic
Released (2.4.29-1ubuntu4.1)
cosmic
Released (2.4.29-1ubuntu4.1)
Patches:
upstream: http://svn.apache.org/viewvc?view=revision&revision=1824336
upstream: http://svn.apache.org/viewvc?view=revision&revision=1824456 (2.4)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H