CVE-2018-14618

NameCVE-2018-14618
Descriptioncurl 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.)
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1498-1, DSA-4286-1
NVD severityhigh (attack range: remote)
Debian Bugs908327

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
curl (PTS)jessie7.38.0-4+deb8u11vulnerable
jessie (security)7.38.0-4+deb8u16fixed
stretch (security), stretch7.52.1-5+deb9u9fixed
buster7.64.0-4fixed
bullseye, sid7.66.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
curlsource(unstable)7.62.0-1high908327
curlsourcejessie7.38.0-4+deb8u12highDLA-1498-1
curlsourcestretch7.52.1-5+deb9u7highDSA-4286-1

Notes

https://curl.haxx.se/docs/CVE-2018-14618.html
https://github.com/curl/curl/issues/2756
https://github.com/curl/curl/commit/57d299a499155d4b327e341c6024e293b0418243

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