Red Hat update for ghostscript



Risk High
Patch available YES
Number of vulnerabilities 9
CVE-ID CVE-2018-15911
CVE-2018-16541
CVE-2018-16802
CVE-2018-17183
CVE-2018-17961
CVE-2018-18073
CVE-2018-18284
CVE-2018-19134
CVE-2018-19409
CWE-ID CWE-20
CWE-121
CWE-94
CWE-264
CWE-843
Exploitation vector Network
Public exploit Public exploit code for vulnerability #5 is available.
Public exploit code for vulnerability #7 is available.
Public exploit code for vulnerability #8 is available.
Vulnerable software
 Red Hat Enterprise Linux for IBM z Systems
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Power
Operating systems & Components / Operating system

Red Hat Enterprise Linux Server
Operating systems & Components / Operating system

Red Hat Enterprise Linux for Scientific Computing
Operating systems & Components / Operating system

Red Hat Enterprise Linux for ARM
Operating systems & Components / Operating system

Red Hat Enterprise Linux Desktop
Operating systems & Components / Operating system

Red Hat Enterprise Linux Workstation
Operating systems & Components / Operating system

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains information about 9 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU14562

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-15911

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the bypass of the -dSAFER option. A remote unauthenticated attacker can submit a specially crafted PostScript file, cause uninitialized memory access in the aesdecode operator and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise. 

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux for ARM: 6.4

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Improper input validation

EUVDB-ID: #VU15785

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-16541

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to insufficient validation of user-supplied input. A remote attacker can supply crafted PostScript files, use incorrect free logic in pagedevice replacement and crash the interpreter.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Stack-based buffer overflow

EUVDB-ID: #VU16576

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-16802

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to incorrect "restoration of privilege" checking when running out of stack during exception handling. A remote unauthenticated attacker can supply specially crafted PostScript, trigger memory corruption and execute code using the "pipe" instruction.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note: the vulnerability exists due to an incomplete fix for CVE-2018-16509.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Code Injection

EUVDB-ID: #VU15375

Risk: High

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-17183

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to the application allowed a user-writable error exception table. A remote attacker can use a specially crafted PostScript file to overwrite error handlers and inject arbitrary code.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Code Injection

EUVDB-ID: #VU15376

Risk: High

CVSSv4.0: 7.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-17961

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation that allows sandbox bypass via error handler setup vectors. A remote attacker can pass a specially crafted PostScript file to the affected application, inject and execute arbitrary code on the target system.

Note: this vulnerability exists due to insufficient patch for previously fixed Code injection vulnerability (CVE-2018-17183).

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

6) Security restrictions bypass

EUVDB-ID: #VU15748

Risk: Low

CVSSv4.0: 2.7 [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]

CVE-ID: CVE-2018-18073

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to exposure of system operators in the saved execution stack in an error object. A remote attacker can bypass a sandbox protection mechanism to conduct further attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

7) Code injection

EUVDB-ID: #VU15463

Risk: High

CVSSv4.0: 7.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-18284

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass the sandbox protection mechanism on the target system.

The vulnerability exists due to the failure of the sandbox protection mechanism of the affected software when the 1Policy operator is used. A remote unauthenticated attacker can trick the victim into accessing a PostScript file that submits malicious input, bypass the sandbox protection mechanism and modify or replace error handlers used by the software, which the attacker could use to inject and execute arbitrary code on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

8) Type confusion

EUVDB-ID: #VU16577

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-19134

CWE-ID: CWE-843 - Type confusion

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to missing type check in line 292 of zcolor.c. A remote unauthenticated attacker can trigger memory corruption and execute code using the "pipe" instruction.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

9) Security restrictions bypass

EUVDB-ID: #VU16020

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-19409

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local attacker to bypass security restrictions on the target system.

The vulnerability exists due to improper checks of the LockSafetyParams device parameter if another device is used as the top device. A local attacker can make a .setdevice call and bypass security restrictions If another device, such as the pdf14 compositor, is the top device on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Red Hat Enterprise Linux for IBM z Systems: 7 - 7.6

Red Hat Enterprise Linux for Power: 7.6 - 9

Red Hat Enterprise Linux Server: 7 - 7.6

Red Hat Enterprise Linux for Scientific Computing: 7

Red Hat Enterprise Linux Desktop: 7

Red Hat Enterprise Linux Workstation: 7

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2018:3834


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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