CVE-2017-13090
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 36.6%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.0
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 36.56% probability · 98th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122, CWE-119
- Affected
- gnu/wget · debian/debian linux
- Source
- cret@cert.org
References
- http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bbaIssue Tracking, Patch, Third Party Advisory
- http://www.debian.org/security/2017/dsa-4008Issue Tracking, Third Party Advisory
- http://www.securityfocus.com/bid/101590Issue Tracking, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039661Issue Tracking, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:3075
- https://security.gentoo.org/glsa/201711-06Issue Tracking, Third Party Advisory
- https://www.synology.com/support/security/Synology_SA_17_62_Wget
- https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.htmlIssue Tracking, Patch, Third Party Advisory
- http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bbaIssue Tracking, Patch, Third Party Advisory
- http://www.debian.org/security/2017/dsa-4008Issue Tracking, Third Party Advisory
- http://www.securityfocus.com/bid/101590Issue Tracking, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039661Issue Tracking, Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:3075
- https://security.gentoo.org/glsa/201711-06Issue Tracking, Third Party Advisory
- https://www.synology.com/support/security/Synology_SA_17_62_Wget
- https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.htmlIssue Tracking, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.