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Bug 774090 (CVE-2021-28041) - <net-misc/openssh-8.5_p1: Double-free in ssh-agent (CVE-2021-28041)
Summary: <net-misc/openssh-8.5_p1: Double-free in ssh-agent (CVE-2021-28041)
Alias: CVE-2021-28041
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
Whiteboard: A3 [glsa+ cve]
Depends on: 763051 774177
  Show dependency tree
Reported: 2021-03-03 17:59 UTC by Sam James
Modified: 2021-05-26 10:37 UTC (History)
1 user (show)

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


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Description Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-03-03 17:59:13 UTC
From OpenSSH 8.5 release notes [0]:


 * ssh-agent(1): fixed a double-free memory corruption that was
   introduced in OpenSSH 8.2 . We treat all such memory faults as
   potentially exploitable. This bug could be reached by an attacker
   with access to the agent socket.

   On modern operating systems where the OS can provide information
   about the user identity connected to a socket, OpenSSH ssh-agent
   and sshd limit agent socket access only to the originating user
   and root. Additional mitigation may be afforded by the system's
   malloc(3)/free(3) implementation, if it detects double-free

   The most likely scenario for exploitation is a user forwarding an
   agent either to an account shared with a malicious user or to a
   host with an attacker holding root access.

* [irrelevant vulnerability for non-Sun PAM]"

Comment 1 Larry the Git Cow gentoo-dev 2021-03-04 07:04:02 UTC
The bug has been referenced in the following commit(s):

commit 77e3bbd9528150668daa02b6afffe1183a482782
Author:     Patrick McLean <>
AuthorDate: 2021-03-04 07:03:14 +0000
Commit:     Patrick McLean <>
CommitDate: 2021-03-04 07:03:14 +0000

    net-misc/openssh-8.5_p1: Version bump
    Copyright: Sony Interactive Entertainment Inc.
    Package-Manager: Portage-3.0.16, Repoman-3.0.2
    Signed-off-by: Patrick McLean <>

 net-misc/openssh/Manifest                          |   6 +
 .../openssh/files/openssh-8.5_p1-GSSAPI-dns.patch  | 112 +++++
 .../files/openssh-8.5_p1-X509-glue-13.0.patch      |  73 +++
 .../files/openssh-8.5_p1-hpn-15.1-X509-glue.patch  | 325 +++++++++++++
 .../files/openssh-8.5_p1-hpn-15.1-glue.patch       | 242 ++++++++++
 .../files/openssh-8.5_p1-hpn-15.1-sctp-glue.patch  |  18 +
 net-misc/openssh/openssh-8.5_p1.ebuild             | 515 +++++++++++++++++++++
 7 files changed, 1291 insertions(+)
Comment 2 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-03-04 11:57:48 UTC
Thanks! Tell us when ready to stable.
Comment 3 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-03-28 05:44:07 UTC
ping? chutzpah had no objections
Comment 4 Agostino Sarubbo gentoo-dev 2021-03-29 11:51:08 UTC
amd64 stable
Comment 5 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-03-29 14:49:42 UTC
arm done
Comment 6 Thomas Deutschmann (RETIRED) gentoo-dev 2021-03-30 01:17:22 UTC
x86 stable
Comment 7 Rolf Eike Beer archtester 2021-03-30 14:54:44 UTC
hppa stable
Comment 8 Agostino Sarubbo gentoo-dev 2021-03-31 13:53:45 UTC
ppc stable
Comment 9 Agostino Sarubbo gentoo-dev 2021-03-31 14:08:31 UTC
s390 stable
Comment 10 Rolf Eike Beer archtester 2021-04-01 05:29:17 UTC
sparc stable
Comment 11 Agostino Sarubbo gentoo-dev 2021-04-01 17:30:19 UTC
ppc64 stable
Comment 12 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2021-04-12 16:02:14 UTC
arm64 done

all arches done
Comment 13 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2021-04-12 17:16:50 UTC
Please cleanup.
Comment 14 Thomas Deutschmann (RETIRED) gentoo-dev 2021-05-24 00:24:55 UTC
Added to an existing GLSA request.
Comment 15 GLSAMaker/CVETool Bot gentoo-dev 2021-05-26 10:37:35 UTC
This issue was resolved and addressed in
 GLSA 202105-35 at
by GLSA coordinator Thomas Deutschmann (whissi).