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Integer Overflow or Wraparound Affecting curl package, versions <7.58.0-2ubuntu3.3

Severity

 Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.84% (82nd percentile)

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  • Snyk IDSNYK-UBUNTU1804-CURL-358568
  • published25 Sept 2018
  • disclosed5 Sept 2018
Report a new vulnerability Found a mistake?

Introduced: 5 Sep 2018

CVE-2018-14618  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 curl to version 7.58.0-2ubuntu3.3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.)