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Integer Overflow or Wraparound Affecting libcurl-devel package, versions <0:7.55.1-12.amzn2.0.7

Severity

 Recommended
low

Based on Amazon Linux security rating

    Threat Intelligence

    EPSS
    1.16% (85th percentile)

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  • Snyk ID SNYK-AMZN2-LIBCURLDEVEL-1667709
  • published 27 Sep 2021
  • disclosed 5 Sep 2018
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Introduced: 5 Sep 2018

CVE-2018-14618 Open this link in a new tab
CWE-190 Open this link in a new tab

How to fix?

Upgrade Amazon-Linux:2 libcurl-devel to version 0:7.55.1-12.amzn2.0.7 or higher.
This issue was patched in ALAS2-2018-1135.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libcurl-devel package and not the libcurl-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 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.)