LibTIFF 4.0.9 (with JBIG enabled) decodes arbitrarily-sized JBIG into a buffer, ignoring the buffer size, which leads to a tif_jbig.c JBIGDecode out-of-bounds write.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-18557 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of libtiff as shipped with Red Hat Enterprise Linux 5 and 6.
This issue affects the versions of libtiff as shipped with Red Hat Enterprise Linux 7.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 5.3 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity Impact | Low |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | libtiff | Affected |
| Red Hat Enterprise Linux 6 | libtiff | Not affected |
| Red Hat Enterprise Linux 5 | libtiff | Not affected |
Vulmon