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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-1143-1 curl security update
Debian DSA Debian DSA DSA-4007-1 curl security update
EUVD EUVD EUVD-2017-1518 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.
Ubuntu USN Ubuntu USN USN-3441-2 curl vulnerabilities
Ubuntu USN Ubuntu USN USN-3457-1 curl vulnerability
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

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 : Deferred

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

Modified: 2025-04-20T01:37:25.860

Link: CVE-2017-1000257

cve-icon Redhat

Severity : Moderate

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

Links: CVE-2017-1000257 - Bugzilla

cve-icon OpenCVE Enrichment

No data.