ASN.1 date parser overread

Summary

libcurl's ASN1 parser code has the `GTime2str()` function, used for parsing an ASN.1 Generalized Time field. If given an syntactically incorrect field, the parser might end up using -1 for the length of the time fraction, leading to a `strlen()` getting performed on a pointer to a heap buffer area that is not (purposely) null terminated. This flaw most likely leads to a crash, but can also lead to heap contents getting returned to the application when CURLINFO_CERTINFO is used.

Timeline

1. Jul 31, 2024, 8:08 AM UTCCVE published
2. Aug 1, 2024, 8:05 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 15, 2026, 12:33 AM UTCRecord last updated
4. Oct 22, 2026EPSS reached 10%

   FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

• curl curl

  From 8.9.0 · through 8.9.0; From 8.8.0 · through 8.8.0; From 8.7.1 · through 8.7.1; From 8.7.0 · through 8.7.0; From 8.6.0 · through 8.6.0; From 8.5.0 · through 8.5.0; From 8.4.0 · through 8.4.0; From 8.3.0 · through 8.3.0; From 8.2.1 · through 8.2.1; From 8.2.0 · through 8.2.0; From 8.1.2 · through 8.1.2; From 8.1.1 · through 8.1.1; From 8.1.0 · through 8.1.0; From 8.0.1 · through 8.0.1; From 8.0.0 · through 8.0.0; From 7.88.1 · through 7.88.1; From 7.88.0 · through 7.88.0; From 7.87.0 · through 7.87.0; From 7.86.0 · through 7.86.0; From 7.85.0 · through 7.85.0; From 7.84.0 · through 7.84.0; From 7.83.1 · through 7.83.1; From 7.83.0 · through 7.83.0; From 7.82.0 · through 7.82.0; From 7.81.0 · through 7.81.0; From 7.80.0 · through 7.80.0; From 7.79.1 · through 7.79.1; From 7.79.0 · through 7.79.0; From 7.78.0 · through 7.78.0; From 7.77.0 · through 7.77.0; From 7.76.1 · through 7.76.1; From 7.76.0 · through 7.76.0; From 7.75.0 · through 7.75.0; From 7.74.0 · through 7.74.0; From 7.73.0 · through 7.73.0; From 7.72.0 · through 7.72.0; From 7.71.1 · through 7.71.1; From 7.71.0 · through 7.71.0; From 7.70.0 · through 7.70.0; From 7.69.1 · through 7.69.1; From 7.69.0 · through 7.69.0; From 7.68.0 · through 7.68.0; From 7.67.0 · through 7.67.0; From 7.66.0 · through 7.66.0; From 7.65.3 · through 7.65.3; From 7.65.2 · through 7.65.2; From 7.65.1 · through 7.65.1; From 7.65.0 · through 7.65.0; From 7.64.1 · through 7.64.1; From 7.64.0 · through 7.64.0; From 7.63.0 · through 7.63.0; From 7.62.0 · through 7.62.0; From 7.61.1 · through 7.61.1; From 7.61.0 · through 7.61.0; From 7.60.0 · through 7.60.0; From 7.59.0 · through 7.59.0; From 7.58.0 · through 7.58.0; From 7.57.0 · through 7.57.0; From 7.56.1 · through 7.56.1; From 7.56.0 · through 7.56.0; From 7.55.1 · through 7.55.1; From 7.55.0 · through 7.55.0; From 7.54.1 · through 7.54.1; From 7.54.0 · through 7.54.0; From 7.53.1 · through 7.53.1; From 7.53.0 · through 7.53.0; From 7.52.1 · through 7.52.1; From 7.52.0 · through 7.52.0; From 7.51.0 · through 7.51.0; From 7.50.3 · through 7.50.3; From 7.50.2 · through 7.50.2; From 7.50.1 · through 7.50.1; From 7.50.0 · through 7.50.0; From 7.49.1 · through 7.49.1; From 7.49.0 · through 7.49.0; From 7.48.0 · through 7.48.0; From 7.47.1 · through 7.47.1; From 7.47.0 · through 7.47.0; From 7.46.0 · through 7.46.0; From 7.45.0 · through 7.45.0; From 7.44.0 · through 7.44.0; From 7.43.0 · through 7.43.0; From 7.42.1 · through 7.42.1; From 7.42.0 · through 7.42.0; From 7.41.0 · through 7.41.0; From 7.40.0 · through 7.40.0; From 7.39.0 · through 7.39.0; From 7.38.0 · through 7.38.0; From 7.37.1 · through 7.37.1; From 7.37.0 · through 7.37.0; From 7.36.0 · through 7.36.0; From 7.35.0 · through 7.35.0; From 7.34.0 · through 7.34.0; From 7.33.0 · through 7.33.0; From 7.32.0 · through 7.32.0

References 4