CVE-2018-14618
curl - security update
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.)
How to fix CVE-2018-14618
To remediate CVE-2018-14618, upgrade the affected package to a fixed version below.
- —upgrade to 7.61.1-r0 or later
- —upgrade to 7.62.0-1 or later
- —upgrade to 7.38.0-4+deb8u12 or later
- —upgrade to 7.52.1-5+deb9u7 or later
Is CVE-2018-14618 being exploited?
Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 7.61.1-r0
- from 0, < 7.62.0-1
- from 0, < 7.38.0-4+deb8u12
- from 0, < 7.52.1-5+deb9u7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |