The xz_decomp function in xzlib.c in libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different vulnerability than CVE-2015-8035.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-9251 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of libxml2 as shipped with Red Hat Enterprise Linux 5, 6, and 7.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 3.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | Low |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 3 | libxml2 | Not affected |
| Red Hat JBoss Core Services 1 | libxml2 | Affected |
| Red Hat Enterprise Linux 7 | libxml2 | Not affected |
| Red Hat Enterprise Linux 6 | libxml2 | Not affected |
| Red Hat Enterprise Linux 5 | libxml2 | Not affected |
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