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.
The product reads data past the end, or before the beginning, of the intended buffer.
| Link | Tags |
|---|---|
| https://bugs.exim.org/show_bug.cgi?id=2421 | third party advisory issue tracking permissions required |
| https://bugs.php.net/bug.php?id=78338 | third party advisory issue tracking exploit |
| https://vcs.pcre.org/pcre2?view=revision&revision=1092 | patch broken link |
| https://bugzilla.redhat.com/show_bug.cgi?id=1735494 | patch third party advisory issue tracking |
| https://security.gentoo.org/glsa/202006-16 | third party advisory vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/ | vendor advisory mailing list third party advisory |
| https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html | third party advisory mailing list |