SB2018051616 - Heap-based buffer overflow in curl (Alpine package)
Published: May 16, 2018
Security Bulletin ID
SB2018051616
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Heap-based buffer overflow (CVE-ID: CVE-2018-1000300)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.The weakness exists due to heap-based buffer overflow when closing down an FTP connection with very long server command replies. When doing FTP transfers, curl keeps a spare "closure handle" around internally that will be used when an FTP connection gets shut down since the original curl easy handle is then already removed. FTP server response data that gets cached from the original transfer might then be larger than the default buffer size (16 KB) allocated in the "closure handle", which can lead to buffer overwrite. A remote attacker can execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=201bea07cf7afc2a3cae3e5f5aa927a1c1a66c14
- https://git.alpinelinux.org/aports/commit/?id=0a8c160f5bfb61a52f6baa67dd5ce1e6b72038ae
- https://git.alpinelinux.org/aports/commit/?id=1acc8d384b7bbc2890a59f59ab217ef2918ed6db
- https://git.alpinelinux.org/aports/commit/?id=4cf78dce7e8795b6066bcfcac60143bd68d87bfb
- https://git.alpinelinux.org/aports/commit/?id=816ad945de1a845d5a3f498f361c5ec1f1fdf632
- https://git.alpinelinux.org/aports/commit/?id=81f97eef6dbd21c460ec2d7791d4c4fd5b8a7d1c