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.
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html | issue tracking third party advisory patch |
| https://security.gentoo.org/glsa/201711-06 | issue tracking third party advisory vendor advisory |
| http://www.debian.org/security/2017/dsa-4008 | issue tracking third party advisory vendor advisory |
| https://www.synology.com/support/security/Synology_SA_17_62_Wget | |
| http://git.savannah.gnu.org/cgit/wget.git/commit/?id=d892291fb8ace4c3b734ea5125770989c215df3f | issue tracking third party advisory patch |
| http://www.securityfocus.com/bid/101592 | issue tracking vdb entry third party advisory |
| https://github.com/r1b/CVE-2017-13089 | issue tracking third party advisory |
| http://www.securitytracker.com/id/1039661 | issue tracking vdb entry third party advisory |
| https://access.redhat.com/errata/RHSA-2017:3075 | vendor advisory |