Is CVE-2019-17041 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 5%.

What products does CVE-2019-17041 affect?

Tracked products affected include Fedora. Check the version you run to see whether it is affected.

How do I fix CVE-2019-17041?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2019-17041

Q: What is CVE-2019-17041?

CVE-2019-17041 is a critical-severity software vulnerability (Out-of-bounds write) with a CVSS score of 9.8. An issue was discovered in Rsyslog v8.1908.0. contrib/pmaixforwardedfrom/pmaixforwardedfrom.c has a heap overflow in the parser for AIX log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon) but

CRITICAL severity · CVSS 9.8 · Out-of-bounds write

9.8CVSS CRITICAL

Summary

An issue was discovered in Rsyslog v8.1908.0. contrib/pmaixforwardedfrom/pmaixforwardedfrom.c has a heap overflow in the parser for AIX log messages. The parser tries to locate a log message delimiter (in this case, a space or a colon) but fails to account for strings that do not satisfy this constraint. If the string does not match, then the variable lenMsg will reach the value zero and will skip the sanity check that detects invalid log messages. The message will then be considered valid, and the parser will eat up the nonexistent colon delimiter. In doing so, it will decrement lenMsg, a signed integer, whose value was zero and now becomes minus one. The following step in the parser is to shift left the contents of the message. To do this, it will call memmove with the right pointers to the target and destination strings, but the lenMsg will now be interpreted as a huge value, causing a heap overflow.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)5%

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

Affected products we track (1)

Fedora

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://github.com/rsyslog/rsyslog/pull/3884 ↗

CVE-2019-17041

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information