USN-5259-1 fixed several vulnerabilities in Cron. This update provides
the corresponding update for Ubuntu 18.04 LTS.
Original advisory details:
It was discovered that the postinst maintainer script in Cron unsafely
handled file permissions during package install or update operations.
An attacker could possibly use this issue to perform a privilege
escalation attack. (CVE-2017-9525)
Florian Weimer discovered that Cron incorrectly handled certain memory
operations during crontab file creation. An attacker could possibly use
this issue to cause a denial of service. (CVE-2019-9704)
It was discovered that Cron incorrectly handled user input during crontab
file creation. An attacker could possibly use this issue to cause a denial
of service. (CVE-2019-9705)
It was discovered that Cron contained a use-after-free vulnerability in
its force_rescan_user function. An attacker could possibly use this issue
to cause a denial of service. (CVE-2019-9706)
Threat: Trojan-Ransom.LockerGoga
Vulnerability: Code Execution
Description: LockerGoga looks for and loads a DLL named “wow64log.dll” in
WindowsSystem32. Therefore, we can drop our own DLL to intercept and
terminate the malware…
Threat: Ransom.CTBLocker
Vulnerability: Code Execution
Description: CTBLocker looks for and executes DLLs in its current
directory. Therefore, we can hijack a vuln DLL, execute our own code,
control and terminate the malware…
Threat: Trojan-Ransom.Cerber
Vulnerability: Code Execution
Description: Cerber looks for and executes DLLs in its current directory.
Therefore, we can hijack a vuln DLL, execute our own code, control and
terminate the malware…
Threat: Trojan.Ransom.Cryptowall
Vulnerability: Code Execution
Description: Cryptowall looks for and executes DLLs in its current
directory. Therefore, we can hijack a vuln DLL, execute our own code,
control and terminate the malware…
Threat: REvil.Ransom
Vulnerability: Code Execution
Description: REvil looks for and executes DLLs in its current directory.
Therefore, we can hijack a vuln DLL, execute our own code, control and
terminate the malware pre-encryption. The…
Threat: Ransom.WannaCry
Vulnerability: Code Execution
Description: WannaCry looks for and executes DLLs in its current directory.
Therefore, we can hijack a vuln DLL, execute our own code, control and
terminate the malware…
Threat: REvil.Ransom
Vulnerability: Code Execution
Description: REvil looks for and executes DLLs in its current directory.
Therefore, we can potentially hijack a vuln DLL execute our own code,
control and terminate the malware pre-encryption. The exploit…
Threat: Ransom.Conti
Vulnerability: Code Execution
Description: Conti looks for and executes DLLs in its current directory.
Therefore, we can potentially hijack a vuln DLL execute our own code,
control and terminate the malware pre-encryption. The exploit…
