CVE-2017-13090

GNU Wget: heap overflow in HTTP protocol handling

Published Oct 27, 2017 CVSS 3.0 · 8.8 High EPSS 36.6% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-1149-1 wget security update
Debian DSA Debian DSA DSA-4008-1 wget security update
EUVD EUVD EUVD-2017-4608 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.
Ubuntu USN Ubuntu USN USN-3464-1 Wget vulnerabilities
Ubuntu USN Ubuntu USN USN-3464-2 Wget vulnerabilities
History

No history.

Weaknesses

Sources

Status
PUBLISHED
Assigner
certcc
Published
Updated
Sep 16, 2024, 6:23 PM
Reserved
Aug 22, 2017, 12:00 AM
Status
Modified
Published
Oct 27, 2017, 7:29 PM
Modified
Jun 17, 2026, 1:04 AM
Severity
Important
Public date
Oct 26, 2017, 3:00 PM