Project curl Security Advisory, March 14th 2018 - Permalink
curl can be tricked into copying data beyond end of its heap based buffer.
When asked to transfer an RTSP URL, curl could calculate a wrong data length
to copy from the read buffer. The memcpy() call would copy data from the
heap following the buffer to a storage area that would subsequently be
delivered to the application (if it didn't cause a crash). We've managed to
get it to reach several hundreds bytes out of range.
This could lead to information leakage or a denial of service for the application if the server offering the RTSP data can trigger this.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2018-1000122 to this issue.
CWE-126: Buffer Over-read
Severity: Medium
- Affected versions: curl 7.20.0 to and including curl 7.58.0
- Not affected versions: curl < 7.20.0 and curl >= 7.59.0
- Introduced-in: https://github.com/curl/curl/commit/bc4582b68a673d3
libcurl is used by many applications, but not always advertised as such.
In curl version 7.59.0, curl makes sure that this code never gets told to copy more data than it is allowed to read from the buffer.
We suggest you take one of the following actions immediately, in order of preference:
A - Upgrade curl to version 7.59.0
B - Apply the patch to your version and rebuild
It was reported to the curl project on February 20, 2018
We contacted distros@openwall on March 8, 2018.
curl 7.59.0 was released on March 14 2018, coordinated with the publication of this advisory.
- Reported-by: OSS-fuzz
- Help-by: Max Dymond
- Patched-by: Daniel Stenberg
Thanks a lot!