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.
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2017-10-31T21:00:00

Updated: 2024-08-05T22:00:39.661Z

Reserved: 2017-10-31T00:00:00

Link: CVE-2017-1000257

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2017-10-31T21:29:00.203

Modified: 2018-11-13T11:29:07.977

Link: CVE-2017-1000257

cve-icon Redhat

Severity : Moderate

Publid Date: 2017-10-23T00:00:00Z

Links: CVE-2017-1000257 - Bugzilla