Arch Linux Security Advisory ASA-201801-24 ========================================== Severity: Medium Date : 2018-01-29 CVE-ID : CVE-2018-1000005 CVE-2018-1000007 Package : libcurl-gnutls Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-596 Summary ======= The package libcurl-gnutls before version 7.58.0-1 is vulnerable to multiple issues including denial of service and information disclosure. Resolution ========== Upgrade to 7.58.0-1. # pacman -Syu "libcurl-gnutls>=7.58.0-1" The problems have been fixed upstream in version 7.58.0. Workaround ========== None. Description =========== - CVE-2018-1000005 (denial of service) libcurl contains an out bounds read in code handling HTTP/2 trailers. It was reported that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `":"` to the target buffer, while this was recently changed to `": "` (a space was added after the colon) but the associated math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to the libcurl callback. This might lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something. - CVE-2018-1000007 (information disclosure) libcurl might leak authentication data to third parties. When asked to send custom headers in its HTTP requests, libcurl will send that set of headers first to the host in the initial URL but also, if asked to follow redirects and a 30X HTTP response code is returned, to the host mentioned in URL in the `Location:` response header value. Sending the same set of headers to subsequest hosts is in particular a problem for applications that pass on custom `Authorization:` headers, as this header often contains privacy sensitive information or data that could allow others to impersonate the libcurl-using client's request. Impact ====== A remote attacker is able to crash the application or possibly disclose sensitive information on the affected host. References ========== https://curl.haxx.se/docs/adv_2018-824a.html https://github.com/curl/curl/commit/fa3dbb9a147488a2943bda809c66fc497efe06cb https://curl.haxx.se/docs/adv_2018-b3bf.html https://github.com/curl/curl/commit/af32cd3859336ab963591ca0df9b1e33a7ee066b https://security.archlinux.org/CVE-2018-1000005 https://security.archlinux.org/CVE-2018-1000007