SB2018052203 - Denial of service in Bitvise FlowSsh Library
Published: May 22, 2018
Security Bulletin ID
SB2018052203
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Memory corruption (CVE-ID: N/A)
CWE-ID: CWE-119 - Memory corruption
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 unauthenticated attacker to cause DoS condition on the target system.
The weakness exists due to an invalid memory access error. A remote attacker can return a specially crafted packet and cause the service to crash.
2) Race condition (CVE-ID: N/A)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.
The weakness exists in a zlib compression library component due to race condition. A remote attacker can corrupt decompressed data in a different user's session and cause the service to crash.
Remediation
Install update from vendor's website.