Bugzilla – Bug 1005638
VUL-0: CVE-2016-8619: curl: double-free in krb5 code
Last modified: 2019-05-29 07:20:48 UTC
double-free in krb5 code ======================== Project cURL Security Advisory, November 2, 2016 - [Permalink](https://curl.haxx.se/docs/adv_20161102E.html) VULNERABILITY ------------- In curl's implementation of the Kerberos authentication mechanism, the function `read_data()` in security.c is used to fill the necessary krb5 structures. When reading one of the length fields from the socket, it fails to ensure that the length parameter passed to realloc() is not set to 0. This would lead to realloc() getting called with a zero size and when doing so realloc() returns NULL *and* frees the memory - in contrary to normal realloc() fails where it only returns NULL - causing libcurl to free the memory *again* in the error path. This flaw could be triggered by a malicious or just otherwise ill-behaving server. We are not aware of any exploit of this flaw. INFO ---- The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2016-XXXX to this issue. AFFECTED VERSIONS ----------------- This flaw exists in the following curl versions - Affected versions: curl 7.3 to and including 7.50.3 - Not affected versions: curl < 7.3 and curl >= 7.51.0 libcurl is used by many applications, but not always advertised as such! THE SOLUTION ------------ In version 7.51.0, the function reading data will consider reading a zero size to be an error and bail out. A [patch for CVE-2016-XXXX](https://curl.haxx.se/s3c/E.patch) is available. RECOMMENDATIONS --------------- We suggest you take one of the following actions immediately, in order of preference: A - Upgrade curl and libcurl to version 7.51.0 B - Apply the patch to your version and rebuild C - Do not use KRB5 TIME LINE --------- It was first reported to the curl project on September 23 by Cure53. We contacted distros@openwall on October 19. curl 7.51.0 was released on November 2 2016, coordinated with the publication of this advisory. CREDITS ------- This vulnerability was found during a Secure Open Source audit performed by Cure53.
From: Daniel Stenberg We intend to publish the advisories, the patches and announce the new release (7.51.0) with all of these problems fixed on November 2nd. CRD: 2016-11-02
bugbot adjusting priority
SUSE-SU-2016:2699-1: An update that fixes 11 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005640,1005642,1005643,1005645,1005646,998760 CVE References: CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: SUSE Linux Enterprise Software Development Kit 12-SP1 (src): curl-7.37.0-31.1 SUSE Linux Enterprise Server 12-SP1 (src): curl-7.37.0-31.1 SUSE Linux Enterprise Desktop 12-SP1 (src): curl-7.37.0-31.1
SUSE-SU-2016:2700-1: An update that fixes 13 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005642,1005645,1005646,997420,998760 CVE References: CVE-2016-5420,CVE-2016-7141,CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: SUSE Studio Onsite 1.3 (src): curl-7.19.7-1.20.47.2
SUSE-SU-2016:2714-1: An update that fixes 11 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005642,1005645,1005646,998760 CVE References: CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: SUSE Linux Enterprise Software Development Kit 11-SP4 (src): curl-7.19.7-1.64.1 SUSE Linux Enterprise Server 11-SP4 (src): curl-7.19.7-1.64.1 SUSE Linux Enterprise Server 11-SECURITY (src): curl-openssl1-7.19.7-1.64.1 SUSE Linux Enterprise Debuginfo 11-SP4 (src): curl-7.19.7-1.64.1
An update workflow for this issue was started. This issue was rated as moderate. Please submit fixed packages until 2016-11-18. When done, reassign the bug to security-team@suse.de. https://swamp.suse.de/webswamp/wf/63187
openSUSE-SU-2016:2768-1: An update that fixes 11 vulnerabilities is now available. Category: security (important) Bug References: 1005633,1005634,1005635,1005637,1005638,1005640,1005642,1005643,1005645,1005646,998760 CVE References: CVE-2016-7167,CVE-2016-8615,CVE-2016-8616,CVE-2016-8617,CVE-2016-8618,CVE-2016-8619,CVE-2016-8620,CVE-2016-8621,CVE-2016-8622,CVE-2016-8623,CVE-2016-8624 Sources used: openSUSE Leap 42.1 (src): curl-7.37.0-16.1
released