GNU Wget: stack overflow in HTTP protocol handling
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Antti Levomäki, Christian Jalio, Joonas Pihlaja from Forcepoint
References
- https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html
- https://security.gentoo.org/glsa/201711-06
- http://www.debian.org/security/2017/dsa-4008
- https://www.synology.com/support/security/Synology_SA_17_62_Wget
- http://git.savannah.gnu.org/cgit/wget.git/commit/?id=d892291fb8ace4c3b734ea5125770989c215df3f
- http://www.securityfocus.com/bid/101592
- https://github.com/r1b/CVE-2017-13089
- http://www.securitytracker.com/id/1039661
- https://access.redhat.com/errata/RHSA-2017:3075
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