CVE-2018-14618

Published: 05 September 2018

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.)

Priority

Medium

CVSS 3 base score: 9.8

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 18.04 LTS (Bionic Beaver)
Released (7.58.0-2ubuntu3.3)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (7.47.0-1ubuntu2.9)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (7.35.0-1ubuntu2.17)
Patches:
Other: https://github.com/curl/curl/commit/57d299a499155d4b327e341c6024e293b0418243