CVE-2017-1000100 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Reference

http://www.debian.org/security/2017/dsa-3992 http://www.securityfocus.com/bid/100286 http://www.securitytracker.com/id/1039118 https://access.redhat.com/errata/RHSA-2018:3558 https://curl.haxx.se/docs/adv_20170809B.html https://curl.haxx.se/docs/adv_20170809B.html https://security.gentoo.org/glsa/201709-14 https://support.apple.com/HT208221 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. cpe:2.3:a:haxx:libcurl:7.15.0:::::::* cpe:2.3:a:haxx:libcurl:7.15.1:::::::* cpe:2.3:a:haxx:libcurl:7.15.2:::::::* cpe:2.3:a:haxx:libcurl:7.15.3:::::::* cpe:2.3:a:haxx:libcurl:7.15.4:::::::* cpe:2.3:a:haxx:libcurl:7.15.5:::::::* cpe:2.3:a:haxx:libcurl:7.16.0:::::::* cpe:2.3:a:haxx:libcurl:7.16.1:::::::* cpe:2.3:a:haxx:libcurl:7.16.2:::::::* cpe:2.3:a:haxx:libcurl:7.16.3:::::::* cpe:2.3:a:haxx:libcurl:7.16.4:::::::* cpe:2.3:a:haxx:libcurl:7.17.0:::::::* cpe:2.3:a:haxx:libcurl:7.17.1:::::::* cpe:2.3:a:haxx:libcurl:7.18.0:::::::* cpe:2.3:a:haxx:libcurl:7.18.1:::::::* cpe:2.3:a:haxx:libcurl:7.18.2:::::::* cpe:2.3:a:haxx:libcurl:7.19.0:::::::* cpe:2.3:a:haxx:libcurl:7.19.1:::::::* cpe:2.3:a:haxx:libcurl:7.19.2:::::::* cpe:2.3:a:haxx:libcurl:7.19.3:::::::* cpe:2.3:a:haxx:libcurl:7.19.4:::::::* cpe:2.3:a:haxx:libcurl:7.19.5:::::::* cpe:2.3:a:haxx:libcurl:7.19.6:::::::* cpe:2.3:a:haxx:libcurl:7.19.7:::::::* cpe:2.3:a:haxx:libcurl:7.20.0:::::::* cpe:2.3:a:haxx:libcurl:7.20.1:::::::* cpe:2.3:a:haxx:libcurl:7.21.0:::::::* cpe:2.3:a:haxx:libcurl:7.21.1:::::::* cpe:2.3:a:haxx:libcurl:7.21.2:::::::* cpe:2.3:a:haxx:libcurl:7.21.3:::::::* cpe:2.3:a:haxx:libcurl:7.21.4:::::::* cpe:2.3:a:haxx:libcurl:7.21.5:::::::* cpe:2.3:a:haxx:libcurl:7.21.6:::::::* cpe:2.3:a:haxx:libcurl:7.21.7:::::::* cpe:2.3:a:haxx:libcurl:7.22.0:::::::* cpe:2.3:a:haxx:libcurl:7.23.0:::::::* cpe:2.3:a:haxx:libcurl:7.23.1:::::::* cpe:2.3:a:haxx:libcurl:7.24.0:::::::* cpe:2.3:a:haxx:libcurl:7.25.0:::::::* cpe:2.3:a:haxx:libcurl:7.26.0:::::::* cpe:2.3:a:haxx:libcurl:7.27.0:::::::* cpe:2.3:a:haxx:libcurl:7.28.0:::::::* cpe:2.3:a:haxx:libcurl:7.28.1:::::::* cpe:2.3:a:haxx:libcurl:7.29.0:::::::* cpe:2.3:a:haxx:libcurl:7.30.0:::::::* cpe:2.3:a:haxx:libcurl:7.31.0:::::::* cpe:2.3:a:haxx:libcurl:7.32.0:::::::* cpe:2.3:a:haxx:libcurl:7.33.0:::::::* cpe:2.3:a:haxx:libcurl:7.34.0:::::::* cpe:2.3:a:haxx:libcurl:7.35.0:::::::* cpe:2.3:a:haxx:libcurl:7.36.0:::::::* cpe:2.3:a:haxx:libcurl:7.37.0:::::::* cpe:2.3:a:haxx:libcurl:7.37.1:::::::* cpe:2.3:a:haxx:libcurl:7.38.0:::::::* cpe:2.3:a:haxx:libcurl:7.39:::::::* cpe:2.3:a:haxx:libcurl:7.40.0:::::::* cpe:2.3:a:haxx:libcurl:7.41.0:::::::* cpe:2.3:a:haxx:libcurl:7.42.0:::::::* cpe:2.3:a:haxx:libcurl:7.42.1:::::::* cpe:2.3:a:haxx:libcurl:7.43.0:::::::* cpe:2.3:a:haxx:libcurl:7.44.0:::::::* cpe:2.3:a:haxx:libcurl:7.45.0:::::::* cpe:2.3:a:haxx:libcurl:7.46.0:::::::* cpe:2.3:a:haxx:libcurl:7.47.0:::::::* cpe:2.3:a:haxx:libcurl:7.47.1:::::::* cpe:2.3:a:haxx:libcurl:7.48.0:::::::* cpe:2.3:a:haxx:libcurl:7.49.0:::::::* cpe:2.3:a:haxx:libcurl:7.49.1:::::::* cpe:2.3:a:haxx:libcurl:7.50.0:::::::* cpe:2.3:a:haxx:libcurl:7.50.1:::::::* cpe:2.3:a:haxx:libcurl:7.50.2:::::::* cpe:2.3:a:haxx:libcurl:7.50.3:::::::* cpe:2.3:a:haxx:libcurl:7.51.0:::::::* cpe:2.3:a:haxx:libcurl:7.52.0:::::::* cpe:2.3:a:haxx:libcurl:7.52.1:::::::* cpe:2.3:a:haxx:libcurl:7.53.0:::::::* cpe:2.3:a:haxx:libcurl:7.53.1:::::::* cpe:2.3:a:haxx:libcurl:7.54.0:::::::* cpe:2.3:a:haxx:libcurl:7.54.1:::::::*

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.5