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Out-of-Bounds Affecting wget package, versions <1.18-5+deb9u1

Severity

 Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
39.88% (98th percentile)

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  • Snyk IDSNYK-DEBIAN9-WGET-300444
  • published27 Oct 2017
  • disclosed27 Oct 2017
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Introduced: 27 Oct 2017

CVE-2017-13090  (opens in a new tab)
CWE-119  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Debian:9 wget to version 1.18-5+deb9u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream wget package and not the wget package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

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.