Out-of-bounds read in Apache Portable Runtime

1) Out-of-bounds read

EUVDB-ID: #VU56059

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-35940

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to a boundary condition in the "apr_time_exp*()" functions. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.

Note, the vulnerability exists due to a missing patch for #VU9477 (CVE-2017-12613).

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apache Portable Runtime: 1.7.0

CPE2.3

• cpe:2.3:a:apache_foundation:apache_portable_runtime:1.7.0:*:*:*:*:*:*:*

External links

https://mail-archives.apache.org/mod_mbox/www-announce/201710.mbox/%3CCACsi251B8UaLvM-rrH9fv57-zWi0zhyF3275_jPg1a9VEVVoxw@mail.gmail.com%3E
https://lists.apache.org/thread.html/ra2868b53339a6af65577146ad87016368c138388b09bff9d2860f50e%40%3Cdev.apr.apache.org%3E
https://svn.apache.org/viewvc?view=revision&revision=1891198
https://dist.apache.org/repos/dist/release/apr/patches/apr-1.7.0-CVE-2021-35940.patch
https://www.openwall.com/lists/oss-security/2021/08/23/1
https://lists.apache.org/thread.html/ra2868b53339a6af65577146ad87016368c138388b09bff9d2860f50e@%3Cdev.apr.apache.org%3E
https://lists.apache.org/thread.html/rb1f3c85f50fbd924a0051675118d1609e57957a02ece7facb723155b@%3Cannounce.apache.org%3E

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.