Detections
Analytics
CVE-2017-13090
high
Description
The retr.c:fd_read_body() function is called when processing OK responses. 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 read the chunk in pieces of 8192 bytes by using the MIN() macro, but ends up passing the negative chunk length to retr.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. The attacker can corrupt malloc metadata after the allocated buffer.
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://access.redhat.com/errata/RHSA-2017:3075
http://www.securitytracker.com/id/1039661
http://www.securityfocus.com/bid/101590
http://www.debian.org/security/2017/dsa-4008
http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba