CVE-2017-13089 GNU Wget: stack overflow in HTTP protocol handling

2017-10-2700:00:00

CWE-121

certcc

www.cve.org

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

0.645 Medium

EPSS

Percentile

97.9%

JSON

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.

CNA Affected

[
  {
    "platforms": [
      "any"
    ],
    "product": "Wget",
    "vendor": "GNU Project",
    "versions": [
      {
        "status": "affected",
        "version": "prior to 1.19.2"
      }
    ]
  }
]