877607 – (CVE-2022-3559, CVE-2022-3620) <mail-mta/exim-{4.94.2-r7,4.94.2-r9,4.96-r2}: UaF in ACL regexes

Bug 877607 (CVE-2022-3559, CVE-2022-3620) - <mail-mta/exim-{4.94.2-r7,4.94.2-r9,4.96-r2}: UaF in ACL regexes

Summary: <mail-mta/exim-{4.94.2-r7,4.94.2-r9,4.96-r2}: UaF in ACL regexes

Status:	RESOLVED FIXED

Alias:	CVE-2022-3559, CVE-2022-3620

Product:	Gentoo Security
Classification:	Unclassified
Component:	Vulnerabilities (show other bugs)
Hardware:	All Linux

Importance:	Normal minor (vote)
Assignee:	Gentoo Security

URL:	https://bugs.exim.org/show_bug.cgi?id...
Whiteboard:	B4 [noglsa]
Keywords:

Depends on:
Blocks:

Reported:	2022-10-19 02:20 UTC by John Helmert III
Modified:	2022-10-21 14:36 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

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Description John Helmert III archtester

2022-10-19 02:20:33 UTC

CVE-2022-3559:

A vulnerability was found in Exim and classified as critical. This issue affects some unknown processing of the component Regex Handler. The manipulation leads to use after free. The name of the patch is 4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2. It is recommended to apply a patch to fix this issue. The identifier VDB-211073 was assigned to this vulnerability.

Patch: https://git.exim.org/exim.git/commit/4e9ed49f8f12eb331b29bd5b6dc3693c520fddc2):

Surely minimal impact due to ACLs having to be quite crafted.

Comment 1 Larry the Git Cow gentoo-dev

2022-10-19 07:53:38 UTC

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b74dc7a9c13b34133d3691993afdbebd7dd0f59e

commit b74dc7a9c13b34133d3691993afdbebd7dd0f59e
Author:     Fabian Groffen <grobian@gentoo.org>
AuthorDate: 2022-10-19 07:51:00 +0000
Commit:     Fabian Groffen <grobian@gentoo.org>
CommitDate: 2022-10-19 07:53:31 +0000

    mail-mta/exim: revbumps for use-after-free fixes, CVE-2022-3559, cleanup
    
    Bug: https://bugs.gentoo.org/877607
    Signed-off-by: Fabian Groffen <grobian@gentoo.org>

 mail-mta/exim/exim-4.94.2-r7.ebuild                | 11 +--
 ...exim-4.94.2-r8.ebuild => exim-4.94.2-r9.ebuild} | 12 +--
 .../{exim-4.96-r1.ebuild => exim-4.96-r2.ebuild}   | 12 +--
 mail-mta/exim/files/exim-4.94-CVE-2022-3559.patch  | 99 ++++++++++++++++++++++
 .../files/exim-4.96-dmarc_use_after_free.patch     | 31 +++++++
 5 files changed, 141 insertions(+), 24 deletions(-)

Comment 2 John Helmert III archtester

2022-10-19 13:57:35 UTC

Thanks! Given the minimal impact, the CVE description now only says this vulnerability is "problematic", not critical. No GLSA based on that minimal impact. All done!

Comment 3 John Helmert III archtester

2022-10-21 14:36:46 UTC

CVE-2022-3620 (https://git.exim.org/exim.git/commit/12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445):
https://vuldb.com/?id.211919

A vulnerability was found in Exim and classified as problematic. This issue affects the function dmarc_dns_lookup of the file dmarc.c of the component DMARC Handler. The manipulation leads to use after free. The attack may be initiated remotely. The name of the patch is 12fb3842f81bcbd4a4519d5728f2d7e0e3ca1445. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-211919.