Multiple vulnerabilities in X.org libX11
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 3 |
| CVE-ID | CVE-2018-14598 CVE-2018-14599 CVE-2018-14600 |
| CWE-ID | CWE-20 CWE-193 CWE-787 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Xlib Universal components / Libraries / Libraries used by multiple products |
| Vendor | X.org |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
1) Improper input validation
EUVDB-ID: #VU14505
Risk: Low
CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-14598
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to an error when handling malicious input. A remote unauthenticated attacker can cause a remote server to return a specially crafted reply to cause the target X client to crash.
MitigationInstall update from vendor's website.
Vulnerable software versionsXlib: 1.0.1 - 1.6.6
External linkshttp://gitlab.freedesktop.org/xorg/lib/libx11/commit/e83722768fd5c467ef61fa159e8c6278770b45c2
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) Off-by-one error
EUVDB-ID: #VU14503
Risk: High
CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-14599
CWE-ID:
CWE-193 - Off-by-one Error
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to an off-by-one memory write error in the XGetFontPath(), XListExtensions(), and XListFonts() functions. A remote unauthenticated attacker can cause a remote X server to return a specially crafted response to trigger memory corruption and execute arbitrary code on the target X client.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall update from vendor's website.
Vulnerable software versionsXlib: 1.0.1 - 1.6.6
External linkshttp://gitlab.freedesktop.org/xorg/lib/libx11/commit/b469da1430cdcee06e31c6251b83aede072a1ff0
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) Out-of-bounds write
EUVDB-ID: #VU14504
Risk: High
CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-14600
CWE-ID:
CWE-787 - Out-of-bounds write
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to out-of-bounds write when handling malicious input. A remote unauthenticated attacker can trick the victim into opening a specially crafted data, trigger memory corruption and execute arbitrary code on the target X client.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
MitigationInstall update from vendor's website.
Vulnerable software versionsXlib: 1.0.1 - 1.6.6
External linkshttp://gitlab.freedesktop.org/xorg/lib/libx11/commit/dbf72805fd9d7b1846fe9a11b46f3994bfc27fea
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.
