ppkarwasz commented on code in PR #6:
URL: https://github.com/apache/logging-site/pull/6#discussion_r1932009167
##########
_vulnerabilities.adoc:
##########
@@ -106,8 +107,8 @@ Independently discovered by Hideki Okamoto of Akamai
Technologies, Guy Lederfein
|Summary |Thread Context Lookup is vulnerable to remote code execution in
certain configurations
|CVSS 3.x Score & Vector |9.0 CRITICAL
(CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)
|Components affected |`log4j-core`
-|Versions affected |`[2.0-beta9, 2.3.1) ∪ [2.4, 2.12.3) ∪ [2.13.0, 2.17.0)`
-|Versions fixed |`2.3.1` (for Java 6), `2.12.3` (for Java 7), and `2.17.0`
(for Java 8 and later)
+|Versions affected |`[2.0-beta9, 2.3.1) ∪ [2.4, 2.12.3) ∪ [2.13.0, 2.16.0)`
Review Comment:
The way I see it:
- CVE-2021-44228 is about JNDI lookup injection through the `%m` pattern. It
was fixed in `2.15.0`.
- JNDI lookups could come from the recursive evaluation of `${ctx:…}` and
that is why we issued CVE-2021-45046 (and CVE-2021-45105), which were fixed in
`2.16.0`.
These numbers agree with those reported to the NVD and IMHO correcting the
order of evaluation of `%m` patterns and removing recursive evaluation of
`${…}` lookups cuts off all sources of user data that could be fed to the JNDI
lookup.
In case we forgot some call paths that lead to the JNDI lookup, version
`2.16.0`also prevents the instantiation of the lookup in `Interpolator` (its
only caller):
```java
final Class<? extends StrLookup> clazz =
entry.getValue().getPluginClass().asSubclass(StrLookup.class);
if (!clazz.getName().equals(JndiLookup.class.getName()) ||
JndiManager.isJndiEnabled()) {
strLookupMap.put(entry.getKey().toLowerCase(),
ReflectionUtil.instantiate(clazz));
}
```
(see [source
code](https://github.com/apache/logging-log4j2/blob/cffe58f6a433ea1ab60ceb129d4c9b3377acda1d/log4j-core/src/main/java/org/apache/logging/log4j/core/lookup/Interpolator.java#L80-L83))
Version `2.17.0`
(https://github.com/apache/logging-log4j2/commit/4a4b7530b1848e630a65d79e9c7dc388a5a7785b)
only seems to double down this (possibly unnecessary) protection and throws
exceptions from the constructor of the JNDI Lookup.
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