CVE-2017-13090 Detail

Current 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.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score matches with CNA score
CNA:  CERT/CC
Base Score:  8.8 HIGH
Vector:  CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H


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Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

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Hyperlink Resource
http://git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba Issue Tracking  Patch  Third Party Advisory 
http://www.debian.org/security/2017/dsa-4008 Issue Tracking  Third Party Advisory 
http://www.securityfocus.com/bid/101590 Issue Tracking  Third Party Advisory  VDB Entry 
http://www.securitytracker.com/id/1039661 Issue Tracking  Third Party Advisory  VDB Entry 
https://access.redhat.com/errata/RHSA-2017:3075
https://security.gentoo.org/glsa/201711-06 Issue 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.html Issue Tracking  Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer cwe source acceptance level NIST  
CWE-122 Heap-based Buffer Overflow Reference acceptance level CERT/CC  

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Change History

7 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-13090
NVD Published Date:
10/27/2017
NVD Last Modified:
12/29/2017
Source:
MITRE