CVE-2017-13089

HIGH

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.

References

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

Details

Source: MITRE

Published: 2017-10-27

Updated: 2017-12-30

Type: CWE-119

Risk Information

CVSS v2.0

Base Score: 9.3

Vector: (AV:N/AC:M/Au:N/C:C/I:C/A:C)

Impact Score: 10

Exploitability Score: 8.6

Severity: HIGH

CVSS v3.0

Base Score: 8.8

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

Impact Score: 5.9

Exploitability Score: 2.8

Severity: HIGH