Vulnerability Details : CVE-2018-14618
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.)
Vulnerability category: Overflow
Products affected by CVE-2018-14618
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.5:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:a:haxx:libcurl:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-14618
0.53%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 65 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-14618
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
10.0
|
HIGH | AV:N/AC:L/Au:N/C:C/I:C/A:C |
10.0
|
10.0
|
NIST | |
9.8
|
CRITICAL | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST | |
7.5
|
HIGH | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.6
|
5.9
|
Red Hat, Inc. |
CWE ids for CVE-2018-14618
-
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().Assigned by: secalert@redhat.com (Secondary)
-
The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.Assigned by: secalert@redhat.com (Secondary)
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-14618
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https://access.redhat.com/errata/RHSA-2019:1880
RHSA-2019:1880 - Security Advisory - Red Hat Customer Portal
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https://curl.haxx.se/docs/CVE-2018-14618.html
curl - NTLM password overflow via integer overflow - CVE-2018-14618Vendor Advisory
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https://www.debian.org/security/2018/dsa-4286
Debian -- Security Information -- DSA-4286-1 curlThird Party Advisory
-
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0014
SonicWall Security AdvisoryThird Party Advisory
-
https://usn.ubuntu.com/3765-2/
USN-3765-2: curl vulnerability | Ubuntu security noticesThird Party Advisory
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https://usn.ubuntu.com/3765-1/
USN-3765-1: curl vulnerability | Ubuntu security noticesThird Party Advisory
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https://security.gentoo.org/glsa/201903-03
cURL: Multiple vulnerabilities (GLSA 201903-03) — Gentoo securityThird Party Advisory
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https://access.redhat.com/errata/RHSA-2018:3558
RHSA-2018:3558 - Security Advisory - Red Hat Customer PortalThird Party Advisory
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https://cert-portal.siemens.com/productcert/pdf/ssa-436177.pdf
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https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14618
1622707 – (CVE-2018-14618) CVE-2018-14618 curl: NTLM password overflow via integer overflowIssue Tracking
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http://www.securitytracker.com/id/1041605
libcurl Curl_ntlm_core_mk_nt_hash() Buffer Overflow Lets Remote Users Execute Arbitrary Code - SecurityTrackerThird Party Advisory;VDB Entry
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