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

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
apache2 Launchpad, Ubuntu, Debian	artful	Released (2.4.27-2ubuntu4.1)
	bionic	Released (2.4.29-1ubuntu4.1)
	cosmic	Released (2.4.29-1ubuntu4.1)
	trusty	Released (2.4.7-1ubuntu4.20)
	upstream	Released (2.4.30)
	xenial	Released (2.4.18-2ubuntu3.8)
	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

References

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