8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
High
0.399 Low
EPSS
Percentile
97.3%
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.
[
{
"platforms": [
"any"
],
"product": "Wget",
"vendor": "GNU Project",
"versions": [
{
"status": "affected",
"version": "prior to 1.19.2"
}
]
}
]
git.savannah.gnu.org/cgit/wget.git/commit/?id=ba6b44f6745b14dce414761a8e4b35d31b176bba
www.debian.org/security/2017/dsa-4008
www.securityfocus.com/bid/101590
www.securitytracker.com/id/1039661
access.redhat.com/errata/RHSA-2017:3075
security.gentoo.org/glsa/201711-06
www.synology.com/support/security/Synology_SA_17_62_Wget
www.viestintavirasto.fi/en/cybersecurity/vulnerabilities/2017/haavoittuvuus-2017-037.html
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.5 High
AI Score
Confidence
High
0.399 Low
EPSS
Percentile
97.3%