CVE-2017-15710

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.

How to fix CVE-2017-15710

To remediate CVE-2017-15710, upgrade the affected package to a fixed version below.

• —upgrade to 2.4.33-r0 or later
• —upgrade to 2.4.33-1 or later
• —upgrade to 2.2.22-13+deb7u13 or later
• —upgrade to 2.4.10-10+deb8u12 or later

Is CVE-2017-15710 being exploited?

Moderate — EPSS is 13.2%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (4)

• from 0, < 2.4.33-r0
• from 0, < 2.4.33-1
• from 0, < 2.2.22-13+deb7u13
• from 0, < 2.4.10-10+deb8u12

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2017-15710
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2017-15710