Bug 724344 (CVE-2020-9484) – <www-servers/tomcat-{7.0.104,8.5.55}: Remote Code Execution via session persistence (CVE-2020-9484)

• Product: Gentoo Security
• Status: RESOLVED FIXED

[Description Sam James 2020-05-20 15:28:28 UTC]

Description:
If:
a) an attacker is able to control the contents and name of a file on the
  server; and
b) the server is configured to use the PersistenceManager with a
  FileStore; and
c) the PersistenceManager is configured with
  sessionAttributeValueClassNameFilter="null" (the default unless a
  SecurityManager is used) or a sufficiently lax filter to allow the
  attacker provided object to be deserialized; and
d) the attacker knows the relative file path from the storage location
  used by FileStore to the file the attacker has control over;
then, using a specifically crafted request, the attacker will be able to
trigger remote code execution via deserialization of the file under
their control. Note that all of conditions a) to d) must be true for the
attack to succeed.

Mitigation:
- Upgrade to Apache Tomcat 10.0.0-M5 or later
- Upgrade to Apache Tomcat 9.0.35 or later
- Upgrade to Apache Tomcat 8.5.55 or later
- Upgrade to Apache Tomcat 7.0.104 or later
Alternatively, users may configure the PersistenceManager with an
appropriate value for sessionAttributeValueClassNameFilter to ensure
that only application provided attributes are serialized and deserialized.

[Comment 1 Sam James 2020-05-20 15:29:57 UTC]

@maintainer(s), please advise if ready for stabilisation, or call yourself

[Comment 2 NATTkA bot 2020-05-20 15:32:33 UTC]

Sanity check failed:

> www-servers/tomcat-7.0.104
>   depend amd64 stable profile default/linux/amd64/17.0 (28 total)
>     ~dev-java/tomcat-servlet-api-7.0.104:3.0
>   depend amd64 dev profile default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+ (2 total)
>     ~dev-java/tomcat-servlet-api-7.0.104:3.0
>   rdepend amd64 stable profile default/linux/amd64/17.0 (28 total)
>     ~dev-java/tomcat-servlet-api-7.0.104:3.0
>   rdepend amd64 dev profile default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+ (2 total)
>     ~dev-java/tomcat-servlet-api-7.0.104:3.0
> www-servers/tomcat-8.5.55
>   depend amd64 stable profile default/linux/amd64/17.0 (28 total)
>     ~dev-java/tomcat-servlet-api-8.5.55:3.1
>   depend amd64 dev profile default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+ (2 total)
>     ~dev-java/tomcat-servlet-api-8.5.55:3.1
>   rdepend amd64 stable profile default/linux/amd64/17.0 (28 total)
>     ~dev-java/tomcat-servlet-api-8.5.55:3.1
>   rdepend amd64 dev profile default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+ (2 total)
>     ~dev-java/tomcat-servlet-api-8.5.55:3.1

[Comment 3 Miroslav Šulc 2020-05-20 18:01:35 UTC]

please stabilize

[Comment 4 Larry the Git Cow 2020-05-20 18:08:31 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=3ee1ed4c847701b5095b39a29de158554ff74571

commit 3ee1ed4c847701b5095b39a29de158554ff74571
Author:     Miroslav Šulc <[e-mail]>
AuthorDate: 2020-05-20 18:08:08 +0000
Commit:     Miroslav Šulc <[e-mail]>
CommitDate: 2020-05-20 18:08:08 +0000

    www-servers/tomcat: removed vulnerable version 9.0.34
    
    Bug: https://bugs.gentoo.org/724344
    Package-Manager: Portage-2.3.99, Repoman-2.3.22
    Signed-off-by: Miroslav Šulc <[e-mail]>

 www-servers/tomcat/Manifest             |   1 -
 www-servers/tomcat/tomcat-9.0.34.ebuild | 181 --------------------------------
 2 files changed, 182 deletions(-)

[Comment 5 Agostino Sarubbo 2020-05-21 09:03:46 UTC]

amd64 stable.

Maintainer(s), please cleanup.
Security, please add it to the existing request, or file a new one.

[Comment 6 Larry the Git Cow 2020-05-21 10:24:30 UTC]

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=cc31a9948285a982d825c7c8c17151f347d8bea9

commit cc31a9948285a982d825c7c8c17151f347d8bea9
Author:     Miroslav Šulc <[e-mail]>
AuthorDate: 2020-05-21 10:22:59 +0000
Commit:     Miroslav Šulc <[e-mail]>
CommitDate: 2020-05-21 10:22:59 +0000

    www-servers/tomcat: removed vulnerable versions 7.0.103 and 8.5.54
    
    Bug: https://bugs.gentoo.org/724344
    Package-Manager: Portage-2.3.99, Repoman-2.3.22
    Signed-off-by: Miroslav Šulc <[e-mail]>

 www-servers/tomcat/Manifest              |   2 -
 www-servers/tomcat/tomcat-7.0.103.ebuild | 146 ----------------------------
 www-servers/tomcat/tomcat-8.5.54.ebuild  | 158 -------------------------------
 3 files changed, 306 deletions(-)

[Comment 7 GLSAMaker/CVETool Bot 2020-06-15 15:56:17 UTC]

This issue was resolved and addressed in
 GLSA 202006-21 at https://security.gentoo.org/glsa/202006-21
by GLSA coordinator Aaron Bauman (b-man).