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.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-15710 from the MITRE CVE dictionary dictionary and NIST NVD.
CVSS3 Base Score | 5.9 |
---|---|
CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
Attack Vector | Network |
Attack Complexity | High |
Privileges Required | None |
User Interaction | None |
Scope | Unchanged |
Confidentiality | None |
Integrity Impact | None |
Availability Impact | High |
Platform | Errata | Release Date |
---|---|---|
Red Hat Software Collections for Red Hat Enterprise Linux 6 (httpd24-httpd) | RHSA-2018:3558 | 2018-11-13 |
Red Hat Software Collections for Red Hat Enterprise Linux 7 (httpd24-httpd) | RHSA-2018:3558 | 2018-11-13 |
Platform | Package | State |
---|---|---|
Red Hat Mobile Application Platform On-Premise 4 | rhmap-httpd-docker | Not affected |
Red Hat JBoss Web Server 3 | httpd | Not affected |
Red Hat JBoss EWS 2 | httpd | Will not fix |
Red Hat JBoss Core Services 1 | httpd | Affected |
Red Hat Enterprise Linux 7 | httpd | Affected |
Red Hat Enterprise Linux 6 | httpd | Affected |
Red Hat Enterprise Linux 5 | httpd | Will not fix |