CVE-2017-15710

Publication date 26 March 2018

Last updated 25 August 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

Description

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.

Status

Package Ubuntu Release Status
apache2 18.10 cosmic
Fixed 2.4.29-1ubuntu4.1
18.04 LTS bionic
Fixed 2.4.29-1ubuntu4.1
17.10 artful
Fixed 2.4.27-2ubuntu4.1
16.04 LTS xenial
Fixed 2.4.18-2ubuntu3.8
14.04 LTS trusty
Fixed 2.4.7-1ubuntu4.20

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
apache2

Severity score breakdown

Parameter Value
Base score 7.5 · High
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

Related Ubuntu Security Notices (USN)

    • USN-3627-1
    • Apache HTTP Server vulnerabilities
    • 19 April 2018
    • USN-3627-2
    • Apache HTTP Server vulnerabilities
    • 30 April 2018

Other references