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prionPRIOn knowledge basePRION:CVE-2017-15710
HistoryMar 26, 2018 - 3:29 p.m.

Design/Logic Flaw

2018-03-2615:29:00
PRIOn knowledge base
www.prio-n.com
8

8.3 High

AI Score

Confidence

High

0.026 Low

EPSS

Percentile

90.5%

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, β€˜en-US’ is truncated to β€˜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.

References