Release Date: | 2017-10-26 |
The retr.c:fd_read_body() function is called when processing OKresponses. 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.
See more information about CVE-2017-13090 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS v2.0 metrics and score provided are preliminary and subject to review.
Base Score: | 9.3 | Base Metrics: | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Access Vector: | Network | Attack Complexity: | Medium |
Authentication: | None required | Confidentiality Impact: | Complete |
Integrity Impact: | Complete | Availability Impact: | Complete |
Platform | Errata | Release Date |
Oracle Linux version 7 (wget) | ELSA-2017-3075 | 2017-10-26 |
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