CVE-2017-13089
Published: 26 October 2017
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.
Priority
Status
Package | Release | Status |
---|---|---|
wget Launchpad, Ubuntu, Debian |
artful |
Released
(1.19.1-3ubuntu1.1)
|
trusty |
Released
(1.15-1ubuntu1.14.04.3)
|
|
upstream |
Needs triage
|
|
xenial |
Released
(1.17.1-1ubuntu1.3)
|
|
zesty |
Released
(1.18-2ubuntu1.1)
|
|
Patches: upstream: http://git.savannah.gnu.org/cgit/wget.git/commit/?id=d892291fb8ace4c3b734ea5125770989c215df3f |
Severity score breakdown
Parameter | Value |
---|---|
Base score | 8.8 |
Attack vector | Network |
Attack complexity | Low |
Privileges required | None |
User interaction | Required |
Scope | Unchanged |
Confidentiality | High |
Integrity impact | High |
Availability impact | High |
Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |