CVE-2021-3578
A flaw was found in mbsync before v1.3.6 and v1.4.2, where an unchecked pointer cast allows a malicious or compromised server to write an arbitrary integer value past the end of a heap-allocated structure by issuing an unexpected APPENDUID response.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.04%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in mbsync before v1.3.6 and v1.4.2, where an unchecked pointer cast allows a malicious or compromised server to write an arbitrary integer value past the end of a heap-allocated structure by issuing an unexpected APPENDUID response. This could be plausibly exploited for remote code execution on the client.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.04% probability · 62th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-704
- Affected
- isync project/isync · fedoraproject/fedora · debian/debian linux
- Source
- secalert@redhat.com
References
- http://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1961710Not Applicable
- https://bugzilla.redhat.com/show_bug.cgi?id=1967397Issue Tracking, Patch, Third Party Advisory
- https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/Not Applicable
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPIDLIJKNRJHUVBCL7QGAPAAVPIHQGXK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U75UFEWRAZYKVL5NHMPBUOLWN3WXTOEI/
- https://security.gentoo.org/glsa/202208-15Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1961710Not Applicable
- https://bugzilla.redhat.com/show_bug.cgi?id=1967397Issue Tracking, Patch, Third Party Advisory
- https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bug/Not Applicable
- https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RPIDLIJKNRJHUVBCL7QGAPAAVPIHQGXK/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U75UFEWRAZYKVL5NHMPBUOLWN3WXTOEI/
- https://security.gentoo.org/glsa/202208-15Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/06/07/1Mailing List, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.