SB2017121806 - Debian update for rsync
Published: December 18, 2017
Security Bulletin ID
SB2017121806
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
3
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Heap-based buffer over-read (CVE-ID: CVE-2017-16548)
CWE-ID: CWE-126 - Buffer over-read
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists due to the receive_xattr function in xattrs.c does not check for a trailing '' character in an xattr name. A remote attacker can send specially crafted data to the daemon, trigger heap-based buffer over-read and cause the application to crash.
2) Security restrictions bypass (CVE-ID: CVE-2017-17433)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The weakness exists due to the recv_files function in receiver.c in the daemon proceeds with certain file metadata updates before checking for a filename in the daemon_filter_list data structure. A remote attacker can bypass intended access restrictions.
3) Security restrictions bypass (CVE-ID: CVE-2017-17434)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to bypass security restrictions on the target system.
The weakness exists due to the daemon does not check for fnamecmp filenames in the daemon_filter_list data structure (in the recv_files function in receiver.c) and also does not apply the sanitize_paths protection mechanism to pathnames found in "xname follows" strings (in the read_ndx_and_attrs function in rsync.c) and bypass intended access restrictions.
Remediation
Install update from vendor's website.