Multiple vulnerabilities in glibc



Published: 2020-04-07 | Updated: 2020-04-20
Risk High
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-1752
CVE-2020-1751
CWE-ID CWE-416
CWE-787
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Glibc
Universal components / Libraries / Libraries used by multiple products

Vendor GNU

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated 20.04.2020
Added vulnerability #2

1) Use-after-free

EUVDB-ID: #VU26628

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1752

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the glob() function in glibc in the way the tilde expansion was carried out. Directory paths containing an initial tilde followed by a valid username are affected by this issue. A local user can create a specially crafted path that, when processed by the glob() function, would potentially lead to arbitrary code execution.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Glibc: 2.14.1 - 2.30

External links

http://bugzilla.redhat.com/show_bug.cgi?id=1810718
http://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ddc650e9b3dc916eab417ce9f79e67337b05035c
http://sourceware.org/bugzilla/show_bug.cgi?id=25414


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds write

EUVDB-ID: #VU27033

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1751

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error in the "backtrace" function when handling signal trampolines on PowerPC. A remote attacker can trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Glibc: 2.0 - 2.30

External links

http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1751
http://sourceware.org/bugzilla/show_bug.cgi?id=25423


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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