CVE-2017-1000257
curl - security update
Description
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.
How to fix CVE-2017-1000257
To remediate CVE-2017-1000257, upgrade the affected package to a fixed version below.
- —upgrade to 7.56.1-r0 or later
- —upgrade to 7.56.1-1 or later
- —upgrade to 7.26.0-1+wheezy22 or later
- —upgrade to 7.38.0-4+deb8u7 or later
Is CVE-2017-1000257 being exploited?
Low — EPSS is 1.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 7.56.1-r0
- from 0, < 7.56.1-1
- from 0, < 7.26.0-1+wheezy22
- from 0, < 7.38.0-4+deb8u7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |