CVE-2017-15710 Information

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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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://www.openwall.com/lists/oss-security/2018/03/24/8 http://www.securityfocus.com/bid/103512 http://www.securitytracker.com/id/1040569 https://access.redhat.com/errata/RHSA-2018:3558 https://access.redhat.com/errata/RHSA-2019:0366 https://access.redhat.com/errata/RHSA-2019:0367 https://httpd.apache.org/security/vulnerabilities_24.html https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@3Ccvs.httpd.apache.org3E https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@3Ccvs.httpd.apache.org3E https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@3Ccvs.httpd.apache.org3E https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@3Ccvs.httpd.apache.org3E https://lists.debian.org/debian-lts-announce/2018/05/msg00020.html https://security.netapp.com/advisory/ntap-20180601-0004/ https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us https://usn.ubuntu.com/3627-1/ https://usn.ubuntu.com/3627-2/ https://usn.ubuntu.com/3937-2/ https://www.debian.org/security/2018/dsa-4164 https://www.tenable.com/security/tns-2019-09

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5