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CVE-2017-1000100

Status Candidate

Overview

When doing a TFTP transfer and curl/libcurl is given a URL that contains a very long file name (longer than about 515 bytes), the file name is truncated to fit within the buffer boundaries, but the buffer size is still wrongly updated to use the untruncated length. This too large value is then used in the sendto() call, making curl attempt to send more data than what is actually put into the buffer. The endto() function will then read beyond the end of the heap based buffer. A malicious HTTP(S) server could redirect a vulnerable libcurl-using client to a crafted TFTP URL (if the client hasn't restricted which protocols it allows redirects to) and trick it to send private memory contents to a remote server over UDP. Limit curl's redirect protocols with --proto-redir and libcurl's with CURLOPT_REDIR_PROTOCOLS.

Related Files

Ubuntu Security Notice USN-3441-1
Posted Oct 10, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3441-1 - Daniel Stenberg discovered that curl incorrectly handled large floating point output. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. Even Rouault discovered that curl incorrectly handled large file names when doing TFTP transfers. A remote attacker could use this issue to cause curl to crash, resulting in a denial of service, or possibly obtain sensitive memory contents. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2016-9586, CVE-2017-1000100, CVE-2017-1000101, CVE-2017-1000254, CVE-2017-7407
MD5 | 468c542294e04538fc3029551a7a687a
Gentoo Linux Security Advisory 201709-14
Posted Sep 18, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201709-14 - Multiple vulnerabilities have been found in cURL, the worst of which may allow attackers to bypass intended restrictions. Versions less than 7.55.1 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2017-1000099, CVE-2017-1000100, CVE-2017-1000101, CVE-2017-7407, CVE-2017-7468
MD5 | 377d37f8cbbeb5ad23ef30e363f705fe
Slackware Security Advisory - curl Updates
Posted Aug 9, 2017
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New curl packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.

tags | advisory
systems | linux, slackware
advisories | CVE-2017-1000099, CVE-2017-1000100, CVE-2017-1000101
MD5 | ce48ee8d794272f67c25ea374c6423a2
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