CVEvulnerability

CVE-2018-14618

9.8 CRITICAL Published 2018-09-05 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2018-09-05
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.0 ([email protected])
7.5 HIGH — CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 3.0 ([email protected])
9.8 CRITICAL — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
10.0 HIGH — AV:N/AC:L/Au:N/C:C/I:C/A:C
Weaknesses
CWE-122, CWE-131, CWE-190

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.)

Affected configurations

• haxx libcurl (< 7.61.1) • canonical ubuntu linux 12.04 • canonical ubuntu linux 14.04 • canonical ubuntu linux 16.04 • canonical ubuntu linux 18.04 • debian debian linux 9.0 • redhat enterprise linux 6.0 • redhat enterprise linux 7.0 • redhat enterprise linux 7.4 • redhat enterprise linux 7.5 • redhat enterprise linux 7.6

Related

Weakness · CWE (3)

  • CWE-122 Heap-based Buffer Overflow weakness
  • CWE-131 Incorrect Calculation of Buffer Size weakness
  • CWE-190 Integer Overflow or Wraparound weakness

References