CVE-2017-1000257
Publication date 23 October 2017
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| curl | ||
| 16.04 LTS xenial |
Fixed 7.47.0-1ubuntu2.4
|
|
| 14.04 LTS trusty |
Fixed 7.35.0-1ubuntu2.12
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.1 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-3457-1
- curl vulnerability
- 23 October 2017
- USN-3441-2
- curl vulnerabilities
- 23 October 2017