CVE-2018-16541 - Use After Free

Severity

43%

Complexity

86%

Confidentiality

48%

In Artifex Ghostscript before 9.24, attackers able to supply crafted PostScript files could use incorrect free logic in pagedevice replacement to crash the interpreter.

In Artifex Ghostscript before 9.24, attackers able to supply crafted PostScript files could use incorrect free logic in pagedevice replacement to crash the interpreter.

CVSS 3.0 Base Score 5.5. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

CVSS 2.0 Base Score 4.3. CVSS Attack Vector: network. CVSS Attack Complexity: medium. CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:N/A:P).

Demo Examples

Use After Free

CWE-416

The following example demonstrates the weakness.


               
}
free(buf3R2);

Use After Free

CWE-416

The following code illustrates a use after free error:


               
}
free(ptr);
logError("operation aborted before commit", ptr);

When an error occurs, the pointer is immediately freed. However, this pointer is later incorrectly used in the logError function.

Overview

First reported 6 years ago

2018-09-05 18:29:00

Last updated 5 years ago

2019-03-07 16:06:00

Affected Software

Artifex Ghostscript

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Canonical Ubuntu Linux 18.04 LTS Edition

18.04

Debian Linux 8.0 (Jessie)

8.0

Debian Linux 9.0

9.0

RedHat Enterprise Linux Desktop 7.0

7.0

RedHat Enterprise Linux Server 7.0

7.0

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 7.6

7.6

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.6

7.6

Red Hat Enterprise Linux Server Telecommunications Update Service (TUS) 7.6

7.6

RedHat Enterprise Linux Workstation 7.0

7.0

References

http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=241d91112771a6104de10b3948c3f350d6690c1d

Patch, Vendor Advisory

RHSA-2018:3834

Third Party Advisory

https://bugs.ghostscript.com/show_bug.cgi?id=699664

Issue Tracking, Permissions Required, Vendor Advisory

[debian-lts-announce] 20180913 [SECURITY] [DLA 1504-1] ghostscript security update

Mailing List, Third Party Advisory

GLSA-201811-12

Third Party Advisory

USN-3768-1

Third Party Advisory

https://www.artifex.com/news/ghostscript-security-resolved/

Patch, Vendor Advisory

DSA-4288

Third Party Advisory

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