Vulnerability Description
An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pcre | Pcre2 | >= 10.31, < 10.34 |
| Fedoraproject | Fedora | 31 |
| Splunk | Universal Forwarder | >= 8.2.0, < 8.2.12 |
Related Weaknesses (CWE)
References
- https://bugs.exim.org/show_bug.cgi?id=2421Issue TrackingPermissions RequiredThird Party Advisory
- https://bugs.php.net/bug.php?id=78338ExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494Issue TrackingPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/03/msg00014.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202006-16Third Party Advisory
- https://vcs.pcre.org/pcre2?view=revision&revision=1092Broken LinkPatch
- https://bugs.exim.org/show_bug.cgi?id=2421Issue TrackingPermissions RequiredThird Party Advisory
- https://bugs.php.net/bug.php?id=78338ExploitIssue TrackingThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494Issue TrackingPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/03/msg00014.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202006-16Third Party Advisory
- https://vcs.pcre.org/pcre2?view=revision&revision=1092Broken LinkPatch
FAQ
What is CVE-2019-20454?
CVE-2019-20454 is a vulnerability with a CVSS score of 7.5 (HIGH). An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untruste...
How severe is CVE-2019-20454?
CVE-2019-20454 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-20454?
Check the references section above for vendor advisories and patch information. Affected products include: Pcre Pcre2, Fedoraproject Fedora, Splunk Universal Forwarder.