Date: Wed, 14 Mar 2018 07:55:11 +0100 (CET) From: Daniel Stenberg <daniel@...x.se> To: curl security announcements -- curl users <curl-users@...l.haxx.se>, curl-announce@...l.haxx.se, libcurl hacking <curl-library@...l.haxx.se>, oss-security@...ts.openwall.com Subject: [SECURITY ADVISORY] curl: RTSP RTP buffer over-read RTSP RTP buffer over-read ========================= Project curl Security Advisory, March 14th 2018 - [Permalink](https://curl.haxx.se/docs/adv_2018-b047.html) VULNERABILITY ------------- 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. We are not aware of any exploit of this flaw. INFO ---- This bug was introduced in January 2010 in [this commit](https://github.com/curl/curl/commit/bc4582b68a673d3) when RTSP support was first added. The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2018-1000122 to this issue. CWE-126: Buffer Over-read AFFECTED VERSIONS ----------------- - 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 libcurl is used by many applications, but not always advertised as such. THE SOLUTION ------------ 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. A [patch for CVE-2018-1000122](https://curl.haxx.se/CVE-2018-1000122.patch) is available. RECOMMENDATIONS --------------- 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 TIME LINE --------- It was reported to the curl project on February 20, 2018 We contacted distros@...nwall on March 8, 2018. curl 7.59.0 was released on March 14 2018, coordinated with the publication of this advisory. CREDITS ------- Detected by OSS-fuzz. Assisted by Max Dymond. Patch by Daniel Stenberg. Thanks a lot! -- / daniel.haxx.se
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