CVE-2017-13089 Information

Description

The http.c:skip_short_body() function is called in some circumstances such as when processing redirects. When the response is sent chunked in wget before 1.19.2 the chunk parser uses strtol() to read each chunk’s length but doesn’t check that the chunk length is a non-negative number. The code then tries to skip the chunk in pieces of 512 bytes by using the MIN() macro but ends up passing the negative chunk length to connect.c:fd_read(). As fd_read() takes an int argument the high 32 bits of the chunk length are discarded leaving fd_read() with a completely attacker controlled length argument.

CVSS Vector

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

Reference

http://git.savannah.gnu.org/cgit/wget.git/commit/?id=d892291fb8ace4c3b734ea5125770989c215df3f http://www.debian.org/security/2017/dsa-4008 http://www.securityfocus.com/bid/101592 http://www.securitytracker.com/id/1039661 https://access.redhat.com/errata/RHSA-2017:3075 https://github.com/r1b/CVE-2017-13089 https://security.gentoo.org/glsa/201711-06 https://www.synology.com/support/security/Synology_SA_17_62_Wget https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8