CVE-2017-13090
Publication date 26 October 2017
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| wget | ||
| 16.04 LTS xenial |
Fixed 1.17.1-1ubuntu1.3
|
|
| 14.04 LTS trusty |
Fixed 1.15-1ubuntu1.14.04.3
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.8 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-3464-2
- Wget vulnerabilities
- 30 October 2017
- USN-3464-1
- Wget vulnerabilities
- 26 October 2017