CVE-2020-15953
When a server sends a "begin TLS" response, the client reads additional data (e.g., from a meddler-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.41%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
LibEtPan through 1.9.4, as used in MailCore 2 through 0.6.3 and other products, has a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a meddler-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
- CVSS 3.1
- 7.4 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 2.41% probability · 83th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-74
- Affected
- libetpan project/libetpan · libmailcore/mailcore2 · fedoraproject/fedora · debian/debian linux
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00060.htmlBroken Link
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00075.htmlBroken Link
- https://github.com/dinhvh/libetpan/issues/386Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00026.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M65FVH5XPS23NLHFN3ABEGBSCHZAISXN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QFBWNA5REI5ZGW2DAOEAVHM23MOU6O5J/
- https://security.gentoo.org/glsa/202007-55Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00060.htmlBroken Link
- http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00075.htmlBroken Link
- https://github.com/dinhvh/libetpan/issues/386Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00026.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M65FVH5XPS23NLHFN3ABEGBSCHZAISXN/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QFBWNA5REI5ZGW2DAOEAVHM23MOU6O5J/
- https://security.gentoo.org/glsa/202007-55Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.