[3.4] curl: FTP PWD response parser out of bounds read (CVE-2017-1000254)
When libcurl connects to an FTP server and successfully logs in
(anonymous or not), it asks the server for the
current directory with the PWD command. The server then responds with a
257 response containing the path,
inside double quotes. The returned path name is then kept by libcurl for
subsequent uses.
Due to a flaw in the string parser for this directory name, a directory
name passed like this but without a closing
double quote would lead to libcurl not adding a trailing NUL byte to the
buffer holding the name. When libcurl would
then later access the string, it could read beyond the allocated heap
buffer and crash or wrongly access data
beyond the buffer, thinking it was part of the path.
Affected versions:
libcurl 7.7 to and including 7.55.1
Not affected versions:
libcurl < 7.7 and >= 7.56.0
References:
https://curl.haxx.se/docs/adv\_20171004.html
http://openwall.com/lists/oss-security/2017/10/04/1
Patch:
https://curl.haxx.se/CVE-2017-1000254.patch
(from redmine: issue id 7964, created on 2017-10-04, closed on 2017-10-24)
- Relations:
- parent #7960 (closed)
- Changesets:
- Revision 28b7a2e0 on 2017-10-23T13:16:02Z:
main/curl: security fix (CVE-2017-1000254)
fixes #7964