CVE-2017-13090: GNU Wget: heap overflow in HTTP protocol handling
First published: Mon Oct 23 2017(Updated: )
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.
Credit: cret@cert.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| GNU Wget | <=1.19.1 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 |
Remedy
https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba
- http://www.debian.org/security/2017/dsa-4008
- http://www.securityfocus.com/bid/101590
- http://www.securitytracker.com/id/1039661
- https://access.redhat.com/errata/RHSA-2017:3075
- https://security.gentoo.org/glsa/201711-06
- https://www.synology.com/support/security/Synology_SA_17_62_Wget
- https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1342259&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1342259&action=edit
- http://git.savannah.gnu.org/cgit/wget.git/commit/?id=1cee0861627ce56a880fa300960136aac0cf0fe1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1506720
- https://bugzilla.redhat.com/show_bug.cgi?id=1505445
- collector/nvd-index
- agent/type
- agent/remedy
- agent/softwarecombine
- agent/first-publish-date
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2017-13090
- agent/weakness
- agent/author
- agent/references
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/title
- agent/last-modified-date
- agent/tags
- agent/event
- vendor/gnu
- canonical/gnu wget
- version/gnu wget/1.19.1
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/8.0
- version/debian debian linux/9.0