CVE-2017-1000257

Published: 23 October 2017

An IMAP FETCH response line indicates the size of the returned data, in number of bytes. When that response says the data is zero bytes, libcurl would pass on that (non-existing) data with a pointer and the size (zero) to the deliver-data function. libcurl's deliver-data function treats zero as a magic number and invokes strlen() on the data to figure out the length. The strlen() is called on a heap based buffer that might not be zero terminated so libcurl might read beyond the end of it into whatever memory lies after (or just crash) and then deliver that to the application as if it was actually downloaded.

Priority

Medium

CVSS 3 base score: 9.1

Status

Package Release Status
curl
Launchpad, Ubuntu, Debian
Upstream
Released (7.56.1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (7.55.1-1ubuntu2.1)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (7.47.0-1ubuntu2.4)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (7.35.0-1ubuntu2.12)