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archlinuxArchLinuxASA-201801-21
HistoryJan 29, 2018 - 12:00 a.m.

[ASA-201801-21] rsync: multiple issues

2018-01-2900:00:00
security.archlinux.org
11

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.087

Percentile

94.5%

Arch Linux Security Advisory ASA-201801-21

Severity: High
Date : 2018-01-29
CVE-ID : CVE-2017-16548 CVE-2017-17433 CVE-2017-17434 CVE-2018-5764
Package : rsync
Type : multiple issues
Remote : Yes
Link : https://security.archlinux.org/AVG-542

Summary

The package rsync before version 3.1.3pre1-1 is vulnerable to multiple
issues including access restriction bypass and denial of service.

Resolution

Upgrade to 3.1.3pre1-1.

pacman -Syu “rsync>=3.1.3pre1-1”

The problems have been fixed upstream in version 3.1.3pre1.

Workaround

None.

Description

  • CVE-2017-16548 (denial of service)

The receive_xattr function in xattrs.c in rsync 3.1.2 and
3.1.3-development does not check for a trailing ‘\0’ character in an
xattr name, which allows remote attackers to cause a denial of service
(heap-based buffer over-read and application crash) or possibly have
unspecified other impact by sending crafted data to the daemon.

  • CVE-2017-17433 (access restriction bypass)

The recv_files function in receiver.c in the daemon in rsync 3.1.2, and
3.1.3-development before 2017-11-03, proceeds with certain file
metadata updates before checking for a filename in the
daemon_filter_list data structure, which allows remote attackers to
bypass intended access restrictions.

  • CVE-2017-17434 (access restriction bypass)

The daemon in rsync 3.1.2, and 3.1.3-development before 2017-12-03,
does not check for fnamecmp filenames in the daemon_filter_list data
structure (in the recv_files function in receiver.c) and also does not
apply the sanitize_paths protection mechanism to pathnames found in
“xname follows” strings (in the read_ndx_and_attrs function in
rsync.c), which allows remote attackers to bypass intended access
restrictions.

  • CVE-2018-5764 (access restriction bypass)

The parse_arguments function in options.c in rsyncd in rsync before
3.1.3 does not prevent multiple --protect-args uses, which allows
remote attackers to bypass an argument-sanitization protection
mechanism.

Impact

A remote attacker is able to bypass access restrictions or cause a
denial of service by sending a maliciously crafted request to rsyncd.

References

https://bugs.archlinux.org/task/57111
https://git.samba.org/?p=rsync.git;a=commitdiff;h=47a63d90e71d3e19e0e96052bb8c6b9cb140ecc1
https://git.samba.org/?p=rsync.git;a=commitdiff;h=3e06d40029cfdce9d0f73d87cfd4edaf54be9c51
https://git.samba.org/?p=rsync.git;a=commitdiff;h=5509597decdbd7b91994210f700329d8a35e70a1
https://git.samba.org/?p=rsync.git;a=commitdiff;h=70aeb5fddd1b2f8e143276f8d5a085db16c593b9
https://git.samba.org/?p=rsync.git;a=commitdiff;h=7706303828fcde524222babb2833864a4bd09e07
https://security.archlinux.org/CVE-2017-16548
https://security.archlinux.org/CVE-2017-17433
https://security.archlinux.org/CVE-2017-17434
https://security.archlinux.org/CVE-2018-5764

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanyrsync< 3.1.3pre1-1UNKNOWN

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.087

Percentile

94.5%