CVE-2018-5121: Input Validation
First published: Tue Jan 23 2018(Updated: )
Low descenders on some Tibetan characters in several fonts on OS X are clipped when rendered in the addressbar. When used as part of an Internationalized Domain Name (IDN) this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox | <58 | 58 |
| <58 | 58 | |
| Mozilla Firefox | <=57.0.4 | |
| Apple Mac OS X |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1402368
- https://www.mozilla.org/en-US/security/advisories/mfsa2018-02/
- https://www.mozilla.org/en-US/security/advisories/mfsa2018-02/#CVE-2018-5107
- http://www.securityfocus.com/bid/102786
- http://www.securitytracker.com/id/1040270
- https://www.mozilla.org/security/advisories/mfsa2018-02/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
- CVE-2018-5091
- CVE-2018-5092
- CVE-2018-5093
- CVE-2018-5094
- CVE-2018-5095
- CVE-2018-5097
- CVE-2018-5098
- CVE-2018-5099
- CVE-2018-5100
- CVE-2018-5101
- CVE-2018-5102
- CVE-2018-5103
- CVE-2018-5104
- CVE-2018-5105
- CVE-2018-5106
- CVE-2018-5107
- CVE-2018-5108
- CVE-2018-5109
- CVE-2018-5110
- CVE-2018-5111
- CVE-2018-5112
- CVE-2018-5113
- CVE-2018-5114
- CVE-2018-5115
- CVE-2018-5116
- CVE-2018-5117
- CVE-2018-5118
- CVE-2018-5119
- CVE-2018-5121
- CVE-2018-5122
- CVE-2018-5090
- CVE-2018-5089
Frequently Asked Questions
What is CVE-2018-5121?
CVE-2018-5121 is a vulnerability that affects certain fonts in Mozilla Firefox on OS X, allowing for domain name spoofing attacks.
How does CVE-2018-5121 affect OS X?
CVE-2018-5121 affects OS X by causing low descenders on some Tibetan characters in certain fonts to be clipped when rendered in the address bar.
Does CVE-2018-5121 affect other operating systems?
No, CVE-2018-5121 only affects OS X operating systems.
What is the severity of CVE-2018-5121?
CVE-2018-5121 has a severity score of 5.3 (medium).
How can CVE-2018-5121 be fixed?
To fix CVE-2018-5121, update Mozilla Firefox to version 58 or later.
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