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archlinuxArchLinuxASA-201807-7
HistoryJul 16, 2018 - 12:00 a.m.

[ASA-201807-7] lib32-libcurl-gnutls: arbitrary code execution

2018-07-1600:00:00
security.archlinux.org
11

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access 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

0.013 Low

EPSS

Percentile

85.7%

Arch Linux Security Advisory ASA-201807-7

Severity: High
Date : 2018-07-16
CVE-ID : CVE-2018-0500
Package : lib32-libcurl-gnutls
Type : arbitrary code execution
Remote : Yes
Link : https://security.archlinux.org/AVG-732

Summary

The package lib32-libcurl-gnutls before version 7.61.0-1 is vulnerable
to arbitrary code execution.

Resolution

Upgrade to 7.61.0-1.

pacman -Syu “lib32-libcurl-gnutls>=7.61.0-1”

The problem has been fixed upstream in version 7.61.0.

Workaround

None.

Description

It has been discovered that curl before 7.61.0 might overflow a heap
based memory buffer when sending data over SMTP and using a reduced
read buffer.

When sending data over SMTP, curl allocates a separate “scratch area”
on the heap to be able to escape the uploaded data properly if the
uploaded data contains data that requires it. The size of this
temporary scratch area was mistakenly made to be 2 *
sizeof(download_buffer) when it should have been made 2 *
sizeof(upload_buffer). The upload and the download buffer sizes are
identically sized by default (16KB) but since version 7.54.1, curl can
resize the download buffer into a smaller buffer (as well as larger).
If the download buffer size is set to a value smaller than 10923, the
Curl_smtp_escape_eob() function might overflow the scratch buffer when
sending contents of sufficient size and contents. The curl command line
tool lowers the buffer size when --limit-rate is set to a value smaller
than 16KB.

Impact

A remote attacker is able to execute arbitrary code when sending SMTP
data.

References

https://curl.haxx.se/docs/adv_2018-70a2.html
https://security.archlinux.org/CVE-2018-0500

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanylib32-libcurl-gnutls< 7.61.0-1UNKNOWN

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.5 High

CVSS2

Access Vector

NETWORK

Access 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

0.013 Low

EPSS

Percentile

85.7%

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