CVE-2018-14618 Information

Description

curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.)

CVSS Vector

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

Reference

http://www.securitytracker.com/id/1041605 https://access.redhat.com/errata/RHSA-2018:3558 https://access.redhat.com/errata/RHSA-2019:1880 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14618 https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf https://curl.haxx.se/docs/CVE-2018-14618.html https://curl.haxx.se/docs/CVE-2018-14618.html https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0014 https://security.gentoo.org/glsa/201903-03 https://usn.ubuntu.com/3765-1/ https://usn.ubuntu.com/3765-2/ https://www.debian.org/security/2018/dsa-4286 curl before version 7.61.1 is vulnerable to a buffer overrun in the NTLM authentication code. The internal function Curl_ntlm_core_mk_nt_hash multiplies the length of the password by two (SUM) to figure out how large temporary storage area to allocate from the heap. The length value is then subsequently used to iterate over the password and generate output into the allocated storage buffer. On systems with a 32 bit size_t the math to calculate SUM triggers an integer overflow when the password length exceeds 2GB (2^31 bytes). This integer overflow usually causes a very small buffer to actually get allocated instead of the intended very huge one making the use of that buffer end up in a heap buffer overflow. (This bug is almost identical to CVE-2017-8816.) cpe:2.3:a:haxx:libcurl::::::::

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8