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CVE
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CVE-2017-13090Date: (C)2017-10-30   (M)2018-05-14


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 Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 8.8CVSS Score : 9.3
Exploit Score: 2.8Exploit Score: 8.6
Impact Score: 5.9Impact Score: 10.0
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: MEDIUM
Privileges Required: NONEAuthentication: NONE
User Interaction: REQUIREDConfidentiality: COMPLETE
Scope: UNCHANGEDIntegrity: COMPLETE
Confidentiality: HIGHAvailability: COMPLETE
Integrity: HIGH 
Availability: HIGH 
  
Reference:
BID-101590
SECTRACK-1039661
DSA-4008
GLSA-201711-06
RHSA-2017:3075
http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba
https://www.synology.com/support/security/Synology_SA_17_62_Wget
https://www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html

CPE    3
cpe:/a:gnu:wget:1.19.1
cpe:/o:debian:debian_linux:9.0
cpe:/o:debian:debian_linux:8.0
CWE    1
CWE-119
OVAL    11
oval:org.secpod.oval:def:113435
oval:org.secpod.oval:def:703872
oval:org.secpod.oval:def:113393
oval:org.secpod.oval:def:204698
...

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