Vulnerability CVE-2018-14618


Published: 2018-09-05

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.)

Type:

CWE-190

(Integer Overflow or Wraparound)

CVSS2 => (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
10/10
10/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Redhat -> Enterprise linux 
HAXX -> Libcurl 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
http://www.securitytracker.com/id/1041605
https://access.redhat.com/errata/RHSA-2018:3558
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://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

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