CVE-2017-13090

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.

How to fix CVE-2017-13090

To remediate CVE-2017-13090, upgrade the affected package to a fixed version below.

• —upgrade to 1.19.2-r0 or later
• —upgrade to 1.19.2-1 or later

Is CVE-2017-13090 being exploited?

Moderate — EPSS is 9.7%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (2)

• from 0, < 1.19.2-r0
• from 0, < 1.19.2-1

CVSS scores

References (2)

• ADVISORYsecurity.alpinelinux.org/vuln/CVE-2017-13090
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2017-13090