CVE-2017-13089

high-risk

Published 2017-10-27

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.

Do I need to act?

76.5% chance of exploitation in next 30 days

EPSS score — higher than 23% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 8.8/10 High

NETWORK / LOW complexity

Affected Products (3)

Debian Linux

Wget

Affected Vendors

Gnu Debian

References (18)

Issue Tracking http://git.savannah.gnu.org/cgit/wget.git/commit/?id=d892291fb8ace4c3b734ea51257...

Issue Tracking http://www.debian.org/security/2017/dsa-4008

Issue Tracking http://www.securityfocus.com/bid/101592

Issue Tracking http://www.securitytracker.com/id/1039661

https://access.redhat.com/errata/RHSA-2017:3075

Issue Tracking https://github.com/r1b/CVE-2017-13089

Issue Tracking https://security.gentoo.org/glsa/201711-06

https://www.synology.com/support/security/Synology_SA_17_62_Wget

Issue Tracking https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuv...