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